SIM300D AT Command Set - Distributed Systems and Networking

SIM300D AT Command Set 

SOFTWARE 

SPECIFICATION


Confidential SIMCOM 

Document Name: SIM300D AT Commands Set 

Version: 01.00 

Date: 2006-3-27 

DocId: SIM300D_ATC_V1.00 

Status: Release 

General Notes 

Simcom offers this information as a service to its customers, to support application and 

engineering efforts that use the products designed by Simcom. The information provided is based 

upon requirements specifically provided to Simcom by the customers. Simcom has not undertaken 

any independent search for additional relevant information, including any information that may be 

in the customer’s possession. Furthermore, system validation of this product designed by Simcom 

within a larger electronic system remains the responsibility of the customer or the customer’s 

system integrator. All specifications supplied herein are subject to change. 

Copyright 

This document contains proprietary technical information which is the property of SIMCOM 

Limited., copying of this document and giving it to others and the using or communication of the 

contents thereof, are forbidden without express authority. Offenders are liable to the payment of 

damages. All rights reserved in the event of grant of a patent or the registration of a utility model 

or design. All specification supplied herein are subject to change without notice at any time. 

Copyright © SIMCOM Limited. 2004 

SIM300D_AT_V1.00 Page 2 of 180



0 Version History 

SIM300D_ATC_V1.00 is the first version of SIM300D AT Command Set. 

Chapter Page What is new 




1 Introduction 

1.1 Scope of the document 

This document presents the AT Command Set for SIMCOM cellular engine SIM300D 

1.2 Related documents 

You can visit the SIMCOM Website using the following link: 

http://www.simcom-sh.com 




1.3 Conventions and abbreviations 

In this document, the GSM engines are referred to as following term: 

1) ME (Mobile Equipment); 

2) MS (Mobile Station); 

3) TA (Terminal Adapter); 

4) DCE (Data Communication Equipment) or facsimile DCE(FAX modem, FAX board); 

In application, controlling device controls the GSM engine by sending AT Command via its serial 

interface. The controlling device at the other end of the serial line is referred to as following term: 

1) TE (Terminal Equipment); 

2) DTE (Data Terminal Equipment) or plainly “the application” which is running on an 

embedded system; 

1.4 AT Command syntax 

The "AT" or "at" prefix must be set at the beginning of each command line. To terminate a 

command line enter . 

Commands are usually followed by a response that includes.”” 

Throughout this document, only the responses are presented, are omitted 

intentionally. 

The AT command set implemented by SIM300D is a combination of GSM07.05, GSM07.07 and 

ITU-T recommendation V.25ter and the AT commands developed by SIMCOM. 

Note: Only enter AT command through serial port after SIM300D is power on and 

Unsolicited Result Code “RDY” is received from serial port. And if unsolicited result 

code”SCKS: 0” returned it indicates SIM card isn’t present. 

All these AT commands can be split into three categories syntactically: “basic”, “S parameter”, 

and “extended”. These are as follows: 

1.4.1 Basic syntax 

These AT commands have the format of “AT”, or “AT&”, where “”is the 

command, and “”is/are the argument(s) for that command. An example of this is “ATE”, 

which tells the DCE whether received characters should be echoed back to the DTE according to 

the value of “”. “” is optional and a default will be used if missing. 

1.4.2 S parameter syntax 

These AT commands have the format of “ATS=”, where “” is the index of the S 




register to set, and “”is the value to assign to it. “” is optional; if it is missing, then a 

default value is assigned. 

1.4.3 Extended Syntax 

These commands can operate in several modes, as following table: 

Table 1: Types of AT commands and responses 

Test command AT+=? The mobile equipment returns the list of parameters 

and value ranges set with the corresponding Write 

command or by internal processes. 

Read command AT+? This command returns the currently set value of the 

parameter or parameters. 

Write command AT+= This command sets the user-definable parameter 

values. 

Execution command AT+ The execution command reads non-variable 

parameters affected by internal processes in the GSM 

engine 

1.4.4 Combining AT commands on the same command line 

You can enter several AT commands on the same line. In this case, you do not need to type the 

“AT” or “at” prefix before every command. Instead, you only need type “AT” or “or” at the 

beginning of the command line. Please note to use a semicolon as command delimiter. 

The command line buffer can accept a maximum of 256 characters. If the characters entered 

exceeded this number then none of the command will executed and TA will returns “ERROR”. 

1.4.5 Entering successive AT commands on separate lines 

When you need to enter a series of AT commands on separate lines, please note that you need to 

wait the final response (for example OK, CME error, CMS error) of last AT command you entered 

before you enter the next AT command. 

1.5 Supported character sets 

The SIM300D AT command interface defaults to the GSM character set. The SIM300D supports 

the following character sets: 

• GSM format 

• UCS2 

• HEX 

• IRA 

• PCCP437 

• PCDN 

• 8859_1 

The character set can be set and interrogated using the “AT+CSCS” command (GSM 07.07). 




The character set is defined in GSM specification 07.05. 

The character set affects transmission and reception of SMS and SMS Cell Broadcast messages, 

the entry and display of phone book entries text field and SIM Application Toolkit alpha strings. 

1.6 Flow control 

Flow control is very important for correct communication between the GSM engine and DTE. For 

in the case such as a data or fax call, the sending device is transferring data faster than the 

receiving side is ready to accept. When the receiving buffer reaches its capacity, the receiving 

device should be capable to cause the sending device to pause until it catches up. 

There are basically two approaches to achieve data flow control: software flow control and 

hardware flow control. SIM300D support both two kinds of flow control. 

In Multiplex mode, it is recommended to use the hardware flow control. 

1.6.1 Software flow control (XON/XOFF flow control) 

Software flow control sends different characters to stop (XOFF, decimal 19) and resume (XON, 

decimal 17) data flow. It is quite useful in some applications that only use three wires on the serial 

interface. 

The default flow control approach of SIM300D is hardware flow control (RTS/CTS flow control), 

to enable software flow control in the DTE interface and within GSM engine, type the following 

AT command: 

AT+IFC=1, 1 

This setting is stored volatile, for use after restart, AT+IFC=1, 1 should be stored to the user 

profile with AT&W. 

Ensure that any communications software package (e.g. ProComm Plus, Hyper terminal or 

WinFax Pro) uses software flow control. 

NOTE: 

Software Flow control should not be used for data calls where binary data will be transmitted or 

received (e.g. TCP/IP) as the DTE interface may interpret binary data as flow control characters. 

1.6.2 Hardware flow control (RTS/CTS flow control) 

Hardware flow control achieves the data flow control by controlling the RTS/CTS line. When the 

data transfer should be suspended, the CTS line is set inactive until the transfer from the receiving 

buffer has completed. When the receiving buffer is ok to receive more data, CTS goes active once 

again. 

To achieve hardware flow control, ensure that the RTS/CTS lines are present on your application 

platform. 




2 AT Commands According to V.25TER 

These AT command are designed according to the ITU-T (International Telecommunication Union, 

Telecommunication sector) V.25ter document. 

2.1 Overview of AT Commands According to V.25TER 

Command Description 

A/ 

RE-ISSUES LAST AT COMMAND GIVEN 

ATA ANSWER INCOMING CALL 

ATD MOBILE ORIGINATED CALL TO DIALABLE NUMBER 

ATD> 

ORIGINATE CALL TO PHONE NUMBER IN MEMORY 

ATD> ORIGINATE CALL TO PHONE NUMBER IN CURRENT MEMORY 

ATD> ORIGINATE CALL TO PHONE NUMBER IN MEMORY WHICH 

CORRESPONDS TO ALPHANUMERIC FIELD 

ATDL REDIAL LAST TELEPHONE NUMBER USED 

ATE SET COMMAND ECHO MODE 

ATH DISCONNECT EXISTING CONNECTION 

ATI DISPLAY PRODUCT IDENTIFICATION INFORMATION 

ATL SET MONITOR SPEAKER LOUDNESS 

ATM SET MONITOR SPEAKER MODE 

+++ SWITCH FROM DATA MODE OR PPP ONLINE MODE TO 

COMMAND MODE 

ATO SWITCH FROM COMMAND MODE TO DATA MODE 

ATP SELECT PULSE DIALLING 

ATQ SET RESULT CODE PRESENTATION MODE 

ATS0 SET NUMBER OF RINGS BEFORE AUTOMATICALLY 

ANSWERING THE CALL 

ATS3 SET COMMAND LINE TERMINATION CHARACTER 

ATS4 SET RESPONSE FORMATTING CHARACTER 

ATS5 SET COMMAND LINE EDITING CHARACTER 

ATS6 SET PAUSE BEFORE BLIND DIALLING 

ATS7 SET NUMBER OF SECONDS TO WAIT FOR CONNECTION 

COMPLETION 

ATS8 SET NUMBER OF SECONDS TO WAIT WHEN COMMA DIAL 

MODIFIER USED 

ATS10 SET DISCONNECT DELAY AFTER INDICATING THE ABSENCE OF 

DATA CARRIER 




ATT SELECT TONE DIALLING 

ATV SET RESULT CODE FORMAT MODE 

ATX SET CONNECT RESULT CODE FORMAT AND CALL MONITORING 

ATZ SET ALL CURRENT PARAMETERS TO USER DEFINED PROFILE 

AT&C SET DCD FUNCTION MODE 

AT&D SET DTR FUNCTION MODE 

AT&F SET ALL CURRENT PARAMETERS TO MANUFACTURER 

DEFAULTS 

AT&V DISPLAY CURRENT CONFIGURATION 

AT&W STORE CURRENT PARAMETER TO USER DEFINED PROFILE 

AT+DR V.42BIS DATA COMPRESSION REPORTING CONTROL 

AT+DS V.42BIS DATA COMPRESSION CONTROL 

AT+GCAP REQUEST COMPLETE TA CAPABILITIES LIST 

AT+GMI REQUEST MANUFACTURER IDENTIFICATION 

AT+GMM REQUEST TA MODEL IDENTIFICATION 

AT+GMR REQUEST TA REVISION IDENTIFICATION 

AT+GOI REQUEST GLOBAL OBJECT IDENTIFICATION 

AT+GSN REQUEST TA SERIAL NUMBER IDENTIFICATION (IMEI) 

AT+ICF SET TE-TA CONTROL CHARACTER FRAMING 

AT+IFC SET TE-TA LOCAL DATA FLOW CONTROL 

AT+ILRR SET TE-TA LOCAL RATE REPORTING MODE 

AT+IPR SET FIXED LOCAL RATE 

2.2 Detailed Description of AT Commands According to V.25TER 

2.2.1 A/ Reissues the last command given 

A/ Reissues the last command given 

Execution command 

A/ 

Reference 

V.25ter 

Response 

Re-issues the previous command 

Note: It does not have to end with terminating character. 

Parameter 

Note 

This command does not work when the serial multiplexer is active 




2.2.2 ATA Answers a call 

ATA Answers a call 

Executing command 

ATA 

Reference 

V.25ter 

Response 

TA sends off-hook to the remote station. 

Note1: Any additional commands on the same command line are ignored. 

Note2: This command may be aborted generally by receiving a character 

during execution. The aborting is not possible during some states of 

connection establishment such as handshaking. 

Response in case of data call, if successfully connected 

CONNECT TA switches to data mode. 

Note: output only if ATX parameter setting with the 

>0 

When TA returns to command mode after call release 

OK 

Response in case of voice call, if successfully connected 

OK 

Response if no connection 

NO CARRIER 

Parameter 

Note 

See also ATX 

2.2.3 ATD Mobile originate call to dial a number 

ATD Mobile originate call to dial a number 


ATD[][



Reference 

V.25ter 

If connection successful and non-voice call. 



>0 


OK 

If connection successful and voice call 

OK 

Response in case of voice call, if successfully connected 

OK 

Parameter 

string of dialing digits and optionally V.25ter modifiers 

Emergency call: 

dialing digits: 

0-9, * , #, +, A, B, C 

SIM300D_AT_V1.00 Page 11 of 180 

Following V.25ter modifiers are ignored: 

,(comma), T, P, !, W, @ 

Standardized emergency number 112(no SIM needed) 

string of GSM modifiers: 

I Actives CLIR (Disables presentation of own number 

to called party) 

i Deactivates CLIR (Enable presentation of own 

number to called party) 

G Activates Closed User Group invocation for this call 

only 

g Deactivates Closed User Group invocation for this call 

only 

only required to set up voice call , return to command state 

Note 

� Parameter “I” and “i” only if no *# code is within the dial string 

� is default for last number that can be dialed by ATDL 

� *# codes sent with ATD are treated as voice calls. Therefore, the 

command must be terminated with a semicolon “;” 

� See ATX command for setting result code and call monitoring 

parameters. 

Responses returned after dialing with ATD 

� For voice call two different responses mode can be determined. TA 

returns “OK” immediately either after dialing was completed or after 

the call is established. The setting is controlled by AT+COLP. Factory



default is AT+COLP=0, this cause the TA returns “OK” immediately 

after dialing was completed, otherwise TA will returns “OK”, 

“BUSY”, “NO DIAL TONE”, “NO CARRIER”. 

Using ATD during an active voice call: 

� When a user originates a second voice call while there is already an 

active voice call, the first call will be automatically put on hold. 

� The current states of all calls can be easily checked at any time by 

using the AT+CLCC command. 

2.2.4 ATD> Originate call to phone number in memory 

ATD> Originate call to phone number in memory 


ATD>[][][;] 

Response 

This command can be used to dial a phone number from a specific 

phonebook. 

Note: This command may be aborted generally by receiving an ATH 

command or a character during execution. The aborting is not possible 

during some states of connection establishment such as handshaking. 

If error is related to ME functionality 

+CME ERROR: 

If no dial tone and (parameter setting ATX2 or ATX4) 

NO DIALTONE 

If busy and (parameter setting ATX3 or ATX4) 

BUSY 

If a connection cannot be established 

NO CARRIER 




>0 


OK 

If successfully connected and voice call 

OK 




Reference 

V.25ter 

Parameter 

Phonebook 

"DC" ME dialled calls list 

"FD" SIM fixed dialling-phonebook 

"LD" SIM dialled calls list 

"MC" ME missed (unanswered received) calls list 

"ME" ME phonebook 

"ON" SIM (or ME) own numbers (MSISDNs) list 

"RC" ME received calls list 

"SM" SIM phonebook 

Integer type memory location should be in the range of 


locations available in the memory used 







only 


only 


Note 

� There is no for emergency call (“EN“). 





parameters. 

� For example: The command “ATD>SM7; “is going to dial the phone 

number stored at location 7 in SIM phone book.



2.2.5 ATD> Originate call to phone number in current memory 

ATD> Originate call to phone number in current memory 


ATD>[][< 

G>][;] 

Response 

This command can be used to dial a phone number from current phonebook 

memory. 





+CME ERROR: 


NO DIALTONE 


BUSY 


NO CARRIER 




>0 


OK 


OK 

Parameter 

Integer type memory location should be in the range of 


locations available in the memory used 







only 


only 

only required to set up voice call , return to command state



Reference 

V.25ter 

Note 





parameters. 

2.2.6 ATD> Originate call to phone number in memory which corresponding alpha 

num field 

ATD> Originate call to phone number in memory which corresponding alpha num 

field 


ATD>[I][G] 

[;] 

Response 

This command make the TA attempts to set up an outgoing call to stored 

number. 

All available memories are searched for the entry . 





+CME ERROR: 


NO DIALTONE 


BUSY 


NO CARRIER 




>0 


OK 


OK 




Reference 

V.25ter 

Parameter 

string type value (“x“), which should equal to an 


alphanumeric field in at least one phone book entry in the 

searched memories. str formatted as current TE character set 

specified by +CSCS. 







only 


only 


Note 





parameters. 

2.2.7 ATDL Redial last telephone number used 

ATDL Redial last telephone number used 


ATDL 

Response 

This command redials the last voice and data call number used. 





+CME ERROR: 


NO DIALTONE 


BUSY 


NO CARRIER 

If connection successful and non-voice call.



Reference 

V.25ter 



>0 


OK 


OK 

Note 


parameters. 

2.2.8 ATE Set command echo mode 

ATE Set command echo mode 

Set command 

ATE[] 

Reference 

V.25ter 

Response 

This setting determines whether or not the TA echoes characters received 

from TE during command state. 

OK 

Parameter 

0 Echo mode off 

Note 

2.2.9 ATH Disconnect existing connection 

ATH Disconnect existing connection 


ATH[n] 

Reference 

V.25ter 

Response 

1 Echo mode on 

Disconnect existing call by local TE from command line and terminate call 

OK 

Note: OK is issued after circuit 109(DCD) is turned off, if it was previously 

on. 

Parameter 

0 disconnect from line and terminate call 

Note 




2.2.10 ATI Display product identification information 

ATI Display product identification information 


ATI 

Reference 

V.25ter 

Response 

TA issues product information text 

Example: 

SIMCOM_Ltd 

SIMCOM_SIM300D 

Revision: 1008B02SIM300D32_ATMEL 

OK 

Parameter 

Note 

2.2.11 ATL Set monitor speaker loudness 

ATL Set monitor speaker loudness 


ATL[value] 

Reference 

V.25ter 

Response 

OK 

Parameter 

0 low speaker volume 

Note 

2.2.12 ATM Set monitor speaker mode 

ATM Set monitor speaker mode 


ATM[value] 

Reference 

V.25ter 

1 low speaker volume 

2 medium speaker volume 

3 high speaker volume 

� The two commands ATL and ATM are implemented only for V.25 

Response 

OK 

Parameter 

compatibility reasons and have no effect. 

0 speaker is always off 

Note 


1 speaker on until TA inform TE that carrier has been 

detected 

2 speaker is always on when TA is off-hook 

� The two commands ATL and ATM are implemented only for V.25 

compatibility reasons and have no effect.



2.2.13 +++ Switch from data mode or PPP online mode to command mode 

Switch from data mode or PPP online mode to command mode 


+++ 

Reference 

V.25ter 

Response 

This command is only available during a CSD call or a GPRS connection. 

The +++ character sequence causes the TA to cancel the data flow over the 

AT interface and switch to command mode. This allows you to enter AT 

command while maintaining the data connection to the remote server or, 

accordingly, the GPRS connection. 

OK 

To prevent the +++ escape sequence from being misinterpreted as data, it 

should comply to following sequence: 

1. No characters entered for T1 time (0.5 seconds) 

2. “+++” characters entered with no characters in between 

3. No characters entered for T1 timer (0.5 seconds) 

4. Switch to command mode, otherwise go to step 1. 

Parameter 

Note 

� To return from command mode back to data or PPP online mode: Enter 

ATO. 

2.2.14 ATO Switch from command mode to data mode 

ATO Switch from command mode to data mode 


ATO[n] 

Reference 

V.25ter 

Response 

TA resumes the connection and switches back from command mode to data 

mode. 

If connection is not successfully resumed 

NO CARRIER 

else 

TA returns to data mode from command mode CONNECT Note: 

only if parameter setting X>0 

Parameter 

0 switch from command mode to data mode 

Note 

2.2.15 ATP Select pulse dialing 

ATP Select pulse dialing 


ATP 

Response 

OK 




Reference 

V.25ter 

Parameter 

Note 

� No effect in GSM 

2.2.16 ATQ Set result code presentation mode 

ATQ Set result code presentation mode 


ATQ[] 

Reference 

V.25ter 

Response 

This parameter setting determines whether or not the TA transmits any result 

code to the TE. Information text transmitted in response is not affected by 

this setting. 

OK 

(none) 

Parameter 

If =0: 

If =1: 

0 TA transmits result code 

Note 


1 Result codes are suppressed and not transmitted 

2.2.17 ATS0 set number of rings before automatically answering the call 

ATS0 Set number of rings before automatically answering the call 

Read command 

ATS0? 


ATS0=[] 

Reference 

V.25ter 

Response 

 

OK 

Response 

This parameter setting determines the number of rings before auto-answer. 

OK 

Parameter 

0 automatic answering is disable 

Note 

1-255 enable automatic answering on the ring number 

specified 

� If is set too high, the calling party may hang up before the call can 

be answered automatically. 

2.2.18 ATS3 Set command line termination character 

ATS3 Set command line termination character 



Response 

 

OK





Reference 

V.25ter 

Response 

This parameter setting determines the character recognized by TA to 

terminate an incoming command line. The TA also returns this character in 

output. 

OK 

Parameter 

0-13-127 command line termination character 

Note 

� Default 13 = CR. 

2.2.19 ATS4 Set response formatting character 

ATS4 Set response formatting character 





Reference 

V.25ter 

Response 

 

OK 

Response 

This parameter setting determines the character generated by the TA for 

result code and information text. 

OK 

Parameter 

0-10-127 response formatting character 

Note 

� Default 10 = LF. 

2.2.20 ATS5 Set command line editing character 

ATS5 Set command line editing character 





Reference 

V.25ter 

Response 

 

OK 

Response 

This parameter setting determines the character recognized by TA as a 

request to delete from the command line the immediately preceding 

character. 

OK 

Parameter 

0-8-127 response formatting character 

Note 

� Default 8 = Backspace. 




2.2.21 ATS6 Set pause before blind dialing 

ATS6 Set pause before blind dialing 





Reference 

V.25ter 

Response 

 

OK 

Response 

OK 

Parameter 

0-2-255 number of seconds to wait before blind dialing 

Note 

� No effect for GSM 

2.2.22 ATS7 set number of seconds to wait for connection completion 

ATS7 Set number of seconds to wait for connection completion 





Reference 

V.25ter 

Response 

 

OK 

Response 

This parameter setting determines the amount of time to wait for the 

connection completion in case of answering or originating a call. 

OK 

Parameter 

0-60-255 number of seconds to wait for connection completion 

Note 

� If called party has specified a high value for ATS0=, call setup 

may fail. 

� The correlation between ATS7 and ATS0 is important 

Example: Call may fail if ATS7=30 and ATS0=20. 

� ATS7 is only applicable to data call. 

2.2.23 ATS8 set number of second to wait for comma dial modifier 

ATS8 Set number of second to wait for comma dial modifier 





Reference 

V.25ter 

Response 

 

OK 

Response 

OK 

Parameter 

0 no pause when comma encountered in dial string 

Note 

� No effect for GSM 

1-255 number of seconds to wait 




2.2.24 ATS10 Set disconnect delay after indicating the absence of data carries 

ATS10 Set disconnect delay after indicating the absence of data carrier 





Reference 

V.25ter 

Response 

 

OK 

Response 

This parameter setting determines the amount of time that the TA will 

remain connected in absence of data carrier. If the data carrier is once more 

detected before disconnect, the TA remains connected. 

OK 

Parameter 

1-15-255 number of tenths seconds of delay 

Note 

2.2.25 ATT Select tone dialing 

ATT Select tone dialing 


ATT 

Reference 

V.25ter 

Response 

OK 

Parameter 

Note 

� No effect in GSM 

2.2.26 ATV Set result code format mode 

ATV Set result code format mode 


ATV[] 

Reference 

V.25ter 

Response 

This parameter setting determines the contents of the header and trailer 

transmitted with result codes and information responses. 

When =0 

0 

OK 

Parameter 

When =1 

0 Information response: 

Note 


Short result code format: 

1 Information response: 

Long result code format:



2.2.27 ATX Set CONNECT result code 

ATX Set CONNECT result code 


ATX[] 

Reference 

V.25ter 

Response 

This parameter setting determines whether or not the TA detected the 

presence of dial tone and busy signal and whether or not TA transmits 

particular result codes 

OK 

Parameter 

0 CONNECT result code only returned, dial tone and 

Note 


busy detection are both disabled 

1 CONNECT result code only returned, dial tone 

and busy detection are both disabled 

2 CONNECT result code returned, dial tone 

detection is enabled, busy detection is disabled 

3 CONNECT result code returned, dial tone 

detection is disabled, busy detection is enabled 

4 CONNECT result code returned, dial tone and 

busy detection are both enabled 

2.2.28 ATZ set all current parameters to user defined profile 

ATZ Set all current parameters to user defined profile 


ATZ[] 

Reference 

V.25ter 

Response 

TA sets all current parameters to the user defined profile. 

OK 

Parameter 

0 Reset to profile number 0 

Note 

� The user defined profile is stored in non volatile memory; 

� If the user profile is not valid, it will default to the factory default 

profile; 

� Any additional commands on the same command line are ignored. 

2.2.29 AT&C Set circuit Data Carrier Detect (DCD) function mode 

AT&C Set circuit Data Carrier Detect (DCD) function mode 


AT&C[] 

Response 

This parameter determines how the state of circuit 109(DCD) relates to the 

detection of received line signal from the distant end. 

OK 

Parameter 

0 DCD line is always ON 

1 DCD line is ON only in the presence of data carrier



Reference 

V.25ter 

Note 

2.2.30 AT&D Set circuit Data Terminal Ready (DTR) function mode 

AT&D Set circuit Data Terminal Ready (DTR) function mode 


AT&D[] 

Reference 

V.25ter 

Response 

This parameter determines how the TA responds when circuit 108/2(DTR) 

is changed from the ON to the OFF condition during data mode. 

OK 

Parameter 

0 TA ignores status on DTR 

Note 


1 ON->OFF on DTR: Change to command mode with 

remaining the connected call 

2 ON->OFF on DTR: Disconnect call, change to 

command mode. During state DTR = OFF is 

auto-answer off. 

2.2.31 AT&F Set all current parameters to manufacturer defaults 

AT&F Set all current parameters to manufacturer defaults 


AT&F[] 

Reference 

V.25ter 

Response 

TA sets all current parameters to the manufacturer defined profile. 

OK 

Parameter 

0 set all TA parameters to manufacturer defaults. 

Note 

2.2.32 AT&V Display current configuration 

AT&V Display current configuration 


AT&V[] 

Reference 

V.25ter 

Response 

TA returns the current parameter setting. 

 

OK 

Parameter 

0 profile number 

Note



2.2.33 AT&W Store current parameter to user defined profile 

AT&W Store current parameter to user defined profile 


AT&W[] 

Reference 

V.25ter 

Response 

TA stores the current parameter setting in the user defined profile. 

OK 

Parameter 

0 profile number to store to 

Note 

� The user defined profile is stored in non volatile memory. 

2.2.34 AT+DR V.42bis data compression reporting control 

AT+DR V.42bis data compression reporting control 

Test command 

AT+DR=? 


AT+DR? 


AT+DR= 

Reference 

V.25ter 

Response 

+DR:(list of supported s) 

OK 

Parameter 

See set command. 

Response 

+DR: 

OK 

Parameter 


Response 

This parameter setting determines whether or not intermediate result code of 

the current data compressing is reported by TA to TE after a connection 

establishment. 

OK 

Parameter 

0 reporting disabled 

Note 

1 reporting enabled 

� If the is set to 1, then the intermediate result code reported at 

call set up is: 

+DR: 

NONE data compression is not in use 


V42B Rec. V42bis is in use in both direction 

V42B RD Rec. V42bis is in use in receive direction only 

V42B TD Rec. V42bis is in use in transmit direction only



2.2.35 AT+DS V.42bis data compression control 

AT+DS V.42bis data compression control 


AT+DS=? 


AT+DS? 


AT+DS=[,[< 

n>,[,[]] 

]] 

Reference 

V.25ter 

Response 

+DS:(list of supported s), (list of supported s), (list of 

supported s), (list of supported s) 

OK 

Parameter 


Response 

+DR: ,,, 

OK 

Parameter 


Response 

This parameter setting determines the possible data compression mode by 

TA at the compression negotiation with the remote TA after a call set up. 

OK 

Parameter 

0 NONE 

1 transmit only 

2 receive only 

3 both direction, but allow negotiation 

0 allow negotiation of p0 down 


1 do not allow negotiation of p0 - disconnect on difference 

512-2048 dictionary size 

6-255 maximum string size (default 20) 

Note 

� This command is only for data call; 

� GSM transmits the data transparent. The remote TA may support this 

compression; 

� This command must be used in conjunction with command AT+CRLP 

to enable compression (+CRLP=X,X,X,X,1,X). 

2.2.36 AT+GCAP Request complete TA capabilities list 

AT+GCAP Request complete TA capabilities list 


AT+GCAP=? 


AT+GCAP 

Response 

OK 

Parameter 

Response 

TA reports a list of additional capabilities. 

+GCAP: s 

OK



Reference 

V.25ter 

Parameter 

e.g.: 

Note 

2.2.37 AT+GMI Request manufacture identification 

AT+GMI Request manufacture identification 


AT+GMI=? 


AT+GMI 

Reference 

V.25ter 

Response 

OK 

Parameter 


+CGSM, +FCLASS, +DS 

TA reports one or more lines of information text which permit the user to 

identify the manufacturer. 

SIMCOM_Ltd 

OK 

Parameter 

Note 

2.2.38 AT+GMM Request TA model identification 

AT+GMM Request TA model identification 


AT+GMM=? 


AT+GMM 

Reference 

V.25ter 

Response 

OK 

Parameter 


identify the specific model of device. 


OK 

Parameter 

Note 

2.2.39 AT+GMR Request TA model identification 

AT+GMR Request TA model identification 


AT+GMR=? 

Response 

OK 

Parameter




AT+GMR 

Reference 

V.25ter 


identify the version, revision level or data or other information of the 

device. 

Revision: 1008B02SIM300D_ATMEL 

OK 

Parameter 

Note 

2.2.40 AT+GOI Request global object identification 

AT+GOI Request global object identification 


AT+GOI=? 


AT+GOI 

Reference 

V.25ter 

Response 

OK 

Parameter 

Response 


identify the device, based on the ISO system for registering unique object 

identifiers. 

SIM300D 

OK 

Parameter 

identifier of device type 

see X.208, 209 for the format of 

Note 

2.2.41 AT+GSN Request TA serial number identification (IMEI) 

AT+GSN Request TA serial number identification(IMEI) 


AT+GSN=? 


AT+GSN 

Response 

OK 

Parameter 

Response 

TA reports the IMEI (international mobile equipment identifier) number in 

information text which permit the user to identify the individual ME device. 

 

OK 

Parameter 

IMEI of the telephone(International Mobile station 

Equipment Identity) 




Reference 

V.25ter 

Note 

� The serial number (IMEI) is varied by individual ME device. 

2.2.42 AT+ICF Set TE-TA control character framing 

AT+ICF Set TE-TA control character framing 


AT+ICF=? 


AT+ICF? 


AT+ICF=[,[]] 

Reference 

V.25ter 

Response 

+ICF:(list of supported s), (list of supported s) 

OK 

Parameter 


Response 

+ICF: , 

OK 

Parameter 


Response 

This parameter setting determines the serial interface character framing 

format and parity received by TA from TE. 

OK 

Parameter 

1 8 data 0 parity 2 stop 

0 odd 

Note 






1 even 

2 mark (1) 

3 space (0) 

� The command is applied for command state; 

� The setting of AT+IPR=0 forces AT+ICF=0; 

� The field is ignored if the < format > field specifies no 

parity. 

2.2.43 AT+IFC Set TE-TA local data flow control 

AT+IFC Set TE-TA local data flow control 


AT+IFC=? 

Response 

+IFC:(list of supported s), (list of supported 

s) 

OK 





AT+IFC? 


AT+IFC=[[,]] 

Reference 

V.25ter 

Parameter 


Response 

+IFC: , 

OK 

Parameter 


Response 

This parameter setting determines the data flow control on the serial 

interface for data mode. 

OK 

Parameter 

specifies the method will be used by TE at receive of data 

from TA 

0 None 


1 XON/XOFF, don’t pass characters on to data stack 

2 line 133: Ready for Receiving 

3 XON/XOFF, pass characters on to data stack 

specifies the method will be used by TA at receive of data 

Note 

from TE 

0 None 

1 XON/XOFF 

2 line 106: Clear to send(CTS) 

� This flow control is applied for data mode; 

� SIMCOM use the RTS for this method. 

2.2.44 AT+ILRR Set TE-TA local rate reporting mode 

AT+ILRR Set TE-TA local rate reporting mode 


AT+ILRR=? 


AT+ILRR? 

Response 

+ILRR:(list of supported s 

OK 

Parameter 


Response 

+ILRR: 

OK 

Parameter 

See set command.




AT+ILRR= 

Reference 

V.25ter 

Response 

This parameter setting determines whether or not an intermediate result 

code of local rate is reported at connection establishment. The rate is 

applied after the final result code of the connection is transmitted to TE. 

OK 

Parameter 

0 Disables reporting of local port rate 

Note 

1 Enables reporting of local port rate 

� If the is set to 1, the following intermediate result will comes 

out on connection to indicates the port rate settings 

+ILRR: 

port rate setting on call connection in Baud per second 

0(AutoBauding ,see chapter 2.2.45.1 ) 

300 

1200 

2400 

4800 

9600 

19200 

28800 

38400 

57600 

115200 

2.2.45 AT+IPR Set TE-TA fixed local rate 

AT+IPR Set TE-TA fixed local rate 


AT+IPR=? 


AT+IPR? 


AT+IPR= 

Response 

+IPR: (list of supported auto detectable s),(list of supported 

fixed-onlys) 

OK 

Parameter 


Response 

+IPR: 

OK 

Parameter 


Response 

This parameter setting determines the data rate of the TA on the serial 

interface. The rate of command takes effect following the issuance of any 

result code associated with the current command line. 

OK 




Reference 

V.25ter 

Parameter 

Baud-rate per second 

Note 

0(AutoBauding ,see chapter 2.2.45.1 ) 

300 

1200 

2400 

4800 

9600 

19200 

28800 

38400 

57600 

115200 

Factory setting is AT+IPR=0(autobauding).It can be restored with AT&F 

and AT&Z when you modified the bit rate’s value.. 

2.2.45.1 AutoBauding 

Synchronization between DTE and DCE ensure that DTE and DCE are correctly synchronized and 

the bit rate used by the DTE is detected by the DCE (= ME). To allow the bit rate to be 

synchronized simply issue an "AT" or "at" string. This is necessary when you start up the module 

while autobauding is enabled. It is recommended to wait 3 to 5 seconds before sending the first 

AT character. Otherwise undefined characters might be returned. 

If you want to use autobauding and autoanswer at the same time, you can easily enable the 

DTE-DCE synchronization, when you activate autobauding first and then configure the 

autoanswer mode. 

Restrictions on autobauding operation 

� The serial interface has to be operated at 8 data bits, no parity and 1 stop bit (factory 

setting). 

� Only the strings .AT. or .at. can be detected (neither .aT. nor .At.). 

� Unsolicited Result Codes that may be issued before the ME detects the new bit rate (by 

receiving the first AT command string) will be sent at the previously detected bit rate. 

� The Unsolicited Result Codes “RDY” and so on are not indicated when you start up the 

ME while autobauding is enabled. 

� It is not recommended to switch to autobauding from a bit rate that cannot be detected by 

the autobaud mechnism (e.g. 300 baud). Responses to +IPR=0 and any commands on the 

same line might be corrupted. 

� See also Chapter 2.2.44. 

Autobauding and bit rate after restart 

The most recently detected bit rate cannot be stored when module is powered down (Store bit rate 

determined with AT&W). Therefore, module will detect bit rate again after restart. 




3 AT Commands According to GSM07.07 

3.1 Overview of AT Command According to GSM07.07 


AT+CACM ACCUMULATED CALL METER(ACM) RESET OR QUERY 

AT+CAMM ACCUMULATED CALL METER MAXIMUM(ACMMAX) SET OR 

QUERY 

AT+CAOC ADVICE OF CHARGE 

AT+CBST SELECT BEARER SERVICE TYPE 

AT+CCFC CALL FORWARDING NUMBER AND CONDITIONS CONTROL 

AT+CCUG CLOSED USER GROUP CONTROL 

AT+CCWA CALL WAITING CONTROL 

AT+CEER EXTENDED ERROR REPORT 

AT+CGMI REQUEST MANUFACTURER IDENTIFICATION 

AT+CGMM REQUEST MODEL IDENTIFICATION 

AT+CGMR REQUEST REVISION IDENTIFICATION 

AT+CGSN REQUEST PRODUCT SERIAL NUMBER IDENTIFICATION 

(IDENTICAL WITH +GSN) 

AT+CSCS SELECT TE CHARACTER SET 

AT+CSTA SELECT TYPE OF ADDRESS 

AT+CHLD CALL HOLD AND MULTIPARTY 

AT+CIMI REQUEST INTERNATIONAL MOBILE SUBSCRIBER IDENTITY 

AT+CKPD KEYPAD CONTROL 

AT+CLCC LIST CURRENT CALLS OF ME 

AT+CLCK FACILITY LOCK 

AT+CLIP CALLING LINE IDENTIFICATION PRESENTATION 

AT+CLIR CALLING LINE IDENTIFICATION RESTRICTION 

AT+CMEE REPORT MOBILE EQUIPMENT ERROR 

AT+COLP CONNECTED LINE IDENTIFICATION PRESENTATION 

AT+COPS OPERATOR SELECTION 

AT+CPAS MOBIL EQUIPMENT ACTIVITY STATUS 

AT+CPBF FIND PHONEBOOK ENTRIES 

AT+CPBR READ CURRENT PHONEBOOK ENTRIES 

AT+CPBS SELECT PHONEBOOK MEMORY STORAGE 

AT+CPBW WRITE PHONEBOOK ENTRY 

AT+CPIN ENTER PIN 

AT+CPWD CHANGE PASSWORD 

AT+CR SERVICE REPORTING CONTROL 

AT+CRC SET CELLULAR RESULT CODES FOR INCOMING CALL 




INDICATION 

AT+CREG NETWORK REGISTRATION 

AT+CRLP SELECT RADIO LINK PROTOCOL PARAM.ETER 

AT+CRSM RESTRICTED SIM ACCESS 

AT+CSQ SIGNAL QUALITY REPORT 

AT+FCLASS FAX: SELECT, READ OR TEST SERVICE CLASS 

AT+FMI FAX: REPORT MANUFACTURED ID 

AT+FMM FAX: REPORT MODEL ID 

AT+FMR FAX: REPORT REVISION ID 

AT+VTD TONE DURATION 

AT+VTS DTMF AND TONE GENERATION 

AT+CMUX MULTIPLEXER CONTROL 

AT+CNUM SUBSCRIBER NUMBER 

AT+CPOL PREFERRED OPERATOR LIST 

AT+COPN READ OPERATOR NAMES 

AT+CFUN SET PHONE FUNCTIONALITY 

AT+CCLK CLOCK 

AT+CSIM GENERIC SIM ACCESS 

AT+CALM ALERT SOUND MODE 

AT+CRSL RINGER SOUND LEVEL 

AT+CLVL LOUDSPEAKER VOLUME 

AT+CMUT MUTE CONTROL 

AT+CPUC PRICE PER UNIT CURRENCY TABLE 

AT+CCWE CALL METER MAXIMUM EVENT 

AT+CBC BATTERY CHARGE 

AT+CUSD UNSTRUCTURED SUPPLEMENTARY SERVICE DATA 

AT+CSSN SUPPLEMENTARY SERVICES NOTIFICATION 

3.2 Detailed Descriptions of AT Command According to GSM07.07 

3.2.1 AT+CACM Accumulated Call Meter (ACM) Reset or Query 

AT+CACM Accumulated Call Meter(ACM) Reset or Query 


AT+CACM=? 


AT+CACM? 

Response 

OK 

Parameter 

Response 

TA returns the current value of ACM. 

+CACM: OK 

If error is related to ME functionality: 

+CME ERROR: 

Parameters 





AT+CACM=[] 

Reference 

GSM 07.07 [13] 

string type; three bytes of the current ACM value in 

hexa-decimal format (e.g. "00001E" indicates decimal 

value 30) 

000000 - FFFFFF 

Parameters 

string type: 

Response 

SIM PIN2 

TA resets the Advice of Charge related accumulated call meter (ACM) 

value in SIM file EF (ACM). ACM contains the total number of home 

units for both the current and preceding calls. 

OK 


+CME ERROR: 

Note 

3.2.2 AT+CAMM Accumulated call meter maximum (ACM max) reset or query 

AT+CAMM Accumulated call meter maximum(ACM max) reset or query 


AT+CAMM=? 


AT+ CAMM? 


AT+CAMM=[[,]] 

Response 

OK 

Parameter 

Response 

TA returns the current value of ACM max. 

+CAMM: OK 


+CME ERROR: 

Parameters 

see set command 

Response 

TA sets the Advice of Charge related accumulated call meter maximum 

value in SIM file EF (ACM max). ACM max contains the maximum 

number of home units allowed to be consumed by the subscriber. 

OK 


+CME ERROR: 

Parameters 

string type; three bytes of the max. ACM value in 

000000 


hexa-decimal format (e.g. "00001E" indicates decimal 

value 30) 

disable ACMmax feature 

000001-FFFFFF 

string type



Reference 

GSM 07.07 [13] 

Note 

3.2.3 AT+CAOC Advice of Charge 

AT+CAOC Advice of Charge 


AT+CAOC=? 


AT+CAOC? 


AT+CAOC= 

Reference 

GSM 07.07 [13] 

Response 

SIM PIN2 

+CAOC: list of supported s OK 

Parameters 

see execution command 

Response 

+CAOC: OK 

Parameters 


Response 

TA sets the Advice of Charge supplementary service function mode. 


+CME ERROR: 

If =0, TA returns the current call meter value 

+CAOC: OK 

If =1, TA deactivates the unsolicited reporting of CCM value 

OK 

If =2. TA activates the unsolicited reporting of CCM value 

OK 

Parameter 

0 query CCM value 


1 deactivate the unsolicited reporting of CCM value 

2 activate the unsolicited reporting of CCM value 

string type; three bytes of the current CCM value in 

Note 

3.2.4 AT+CBST Select Bearer Service Type 

AT+CBST Select Bearer Service Type 


AT+CBST=? 

Response 

hex-decimal format (e.g. "00001E" indicates decimal 

value 30); bytes are similarly coded as ACMmax value 

in the SIM 

000000-FFFFFF 

+CBST: (list of supported s) ,(list of supported s) ,(list of 

supported s) OK 

Parameter 

see set command




AT+CBST? 


AT+CBST=[] 

[,[,]]] 

Reference 

GSM 07.07 [14] 

Response 

+CBST: ,, OK 

Parameter 


Response 

TA selects the bearer service with data rate , and the 

connection element to be used when data calls are originated. 

OK 

Parameter 

0 autobauding 

1 300 bps(V.21) 

2 1200 bps(V.22) 

3 1200/75 bps(V.23) 

4 2400 bps(V.22bis) 

5 2400 bps(V.26ter) 

6 4800 bps(V.32) 

7 9600 bps(V.32) 

12 9600 bps(V.34) 

14 14400 bps(V.34) 

65 300 bps (V.110) 

66 1200 bps(V.110 or X.31 flag stuffing) 





0 asynchronous modem 

2 PAD access (asynchronous) 

0 transparent 

1 non-transparent 

Note 

GSM 02.02[1]: lists the allowed combinations of the sub parameters 

3.2.5 AT+CCFC Call Forwarding Number And Conditions Control 

AT+CCFC Call Forwarding Number And Conditions Control 

Test Command 

AT+CCFC=? 

Response 

+CCFC: (list of supported ) OK 

Parameters 

see Write command 




Write Command 

AT+CCFC = 

, 

[, [, 

[, 

[, 

[, 

[,time]]]]]] 

Response 

TA controls the call forwarding supplementary service. Registration, 

erasure, activation, deactivation, and status query are supported. 

Only , and should be entered with mode (0-2,4) 

If 2 and command successful 

OK 

If there is a network error: 

+CCFC: 0, 0 

If =2 and command successful (only in connection with 0 – 

3) 

For registered call forward numbers: 

+CCFC: , [, , [, 

]] [+CCFC: ....] OK 

If no call forward numbers are registered (and therefore all classes are 

inactive): 

+CCFC: , OK 

where =0 and =7 


+CME ERROR: 

Parameters 

 

0 unconditional 

1 mobile busy 

2 no reply 

3 not reachable 

4 all call forwarding (0-3) 

5 all conditional call forwarding (1-3) 

 

0 disable 

1 enable 

2 query status 

3 registration 

4 erasure 

string type phone number of forwarding address in format 

specified 

by 

type of address in integer format; default 145 when dialing string 

includes international access code character "+", otherwise 

129 

string type subaddress of format specified by 




Reference 

GSM07.07 

type of subaddress in integer; default 128 

1 voice 

2 data 

4 fax 

7 all classes 

time, rounded to a multiple of 5 sec. 

1...20..30 

 

0 not active 

1 active 

3.2.6 AT+CCUG Closed User Group control 

AT+CCUG Closed User Group control 

Read Command 

AT+CCUG? 


AT+CCUG=? 


AT+CCUG=[ 

] 

[,[,]]] 

Reference 

Response 

+CCUG: ,, OK 


+CME ERROR: 

Parameter 

see write command 

Response 

OK 

TA sets the Closed User Group supplementary service parameters as a 

default adjustment for all following calls. 

OK 


+CME ERROR: 

Parameter 

0 disable CUG 

1 enable CUG 

0...9 CUG index 


10 no index (preferred CUG taken from subscriber data) 

0 no information 

1 suppress OA (Outgoing Access) 

2 suppress preferential CUG 

3 suppress OA and preferential CUG



3.2.7 AT+CCWA Call Waiting Control 

AT+CCWA Call Waiting Control 


AT+CCWA? 


AT+CCWA=? 


AT+CCWA=[ 

] 

[,[,]]] 

Response 

+CCWA: OK 

Response 

+CCWA: (list of supported s) OK 

Response 

TA controls the Call Waiting supplementary service. Activation, 

deactivation and status query are supported. 

If there is a network error: 

+CCWA: 0, 0 

If 2 and command successful 

OK 

If =2 and command successful 

+CCWA:,[+CCWA:,[...]] OK 

Note :< status>=0 should be returned only if service is not active for any 

i.e. +CCWA: 0, 7 will be returned in this case. 

When mode=2, all active call waiting classes will be reported. In this mode 

the command is abort able by pressing any key. 


+CME ERROR: 

Parameter 

0 disable presentation of an unsolicited result code 


1 enable presentation of an unsolicited result code 

when parameter not given, network is not 

interrogated 

0 disable 

1 enable 


is a sum of integers each representing a class of information 

1 voice (telephony) 

2 data (bearer service) 

4 fax (teleservice) 

7 default(equals to all classes) 

0 not active 

Unsolicited result code 

1 enable 

When the presentation Call Waiting at the TA is enabled (and Call Waiting 

is enabled) and a terminating call set up has attempted during an established 

call, an unsolicited result code is returned: 

+CCWA: ,,[,] 

Parameter 

string type phone number of calling address in format



Reference 

GSM07.07 

 

specified by 

type of address octet in integer format; 

129 Unknown type(IDSN format number) 

128 Unknown type(unknown number format) 

161 National number type(IDSN format) 

145 International number type(ISDN format ) 

177 Network specific number(ISDN format) 

optional string type alphanumeric representation of 

corresponding to the entry found in phone book 

3.2.8 AT+CEER Extended error report 

AT+CEER Extended error report 


AT+CEER=? 


AT+CEER 

Reference 

GSM 07.07 [13] 

Response 

OK 

Response 

TA returns an extended report of the reason for the last call release. 

+CEER: OK 

Parameters 

Reason for last call release as number code 

Note 

3.2.9 AT+CGMI Request manufacturer identification 

AT+CGMI Request manufacturer identification 


AT+CGMI=? 


AT+CGMI 

Reference 

GSM 07.07 [13] 

Response 

OK 

Response 

TA returns manufacturer identification text. 

OK 

Parameters 

 

Note 

3.2.10 AT+CGMM Request model identification 

AT+CGMM Request model identification 


AT+CGMM=? 


AT+CGMM 

Response 

OK 

Response 

TA returns product model identification text. 

OK 




Reference 

GSM 07.07 [13] 

Parameters 

 

Note 

3.2.11 AT+CGMR Request revision identification 

AT+CGMR Request revision identification 


AT+CGMR=? 


AT+CGMR 

Reference 

GSM 07.07 [13] 

Response 

OK 

Response 

TA returns product software version identification text. 

OK 

Parameters 

 

Note 

3.2.12 AT+CGSN Request product serial number identification (Identical with +GSN) 

AT+CGSN Request product serial number identification (Identical with +GSN) 


AT+CGSN=? 


AT+CGSN 

Reference 

GSM 07.07 [13] 

Response 

OK 

Response 

see +GSN 

OK 

Parameters 

see +GSN 

Note 

3.2.13 AT+CSCS Select TE Character Set 

AT+CSCS Select TE Character Set 


AT+CSCS=? 

Response 

+CSCS: (list of supported s) 

Parameters 

Set command Response 

“GSM” GSM default alphabet. 

"HEX" character strings consist only of hexadecimal 

numbers from 00 to FF; 

"IRA" international reference alphabet 

"PCCP" PC character set Code 


"PCDN" PC Danish/Norwegian character set 

“UCS2” UCS2 alphabet 

"8859-1" ISO 8859 Latin 1 character set



AT+CSCS=[] 

Reference 

GSM 07.07 [13] 

Sets which character set are used by the TE. The TA can then 

convert character strings correctly between the TE and ME character sets. 

Parameter 

see Test command 

Note 

3.2.14 AT+CSTA Select Type of Address 

AT+CSTA Select Type of Address 


AT+CSTA=? 


AT+CSTA? 

Reference 

GSM 07.07 [13] 

Response 

+CSTA: (128,129,145, 161,177) 

Response 

+CSTA: OK 

Parameters 

< type > Current address type setting. 

Note 

3.2.15 AT+CHLD Call hold and multiparty 

AT+CHLD Call hold and multiparty 


AT+CHLD=? 


AT+CHLD=[ 

] 

Response 


The ATD command overrides this setting when a number 

is dialed. 






+CHLD: list of supported s 

OK 

Response 

TA controls the supplementary services Call Hold, Multiparty and Explicit 

Call Transfer. Calls can be put on hold, recovered, released, added to 

conversation, and transferred. 

Note These supplementary services are only applicable to tele service 11 

(Speech: Telephony). 

OK 


+CME ERROR:



Reference 

Parameters 

0 Terminate all held calls or UDUB (User Determined 

User Busy) for a waiting call 

1 Terminate all active calls (if any) and accept the other 

call (waiting call or held call) 

1X Terminate the specific call number X (X= 1-7)( active, 

waiting or held) 

2 Place all active calls on hold (if any) and accept the 

other call (waiting call or held call) as the active call 

2X Place all active calls except call X (X= 1-7) on hold 

3 Add the held call to the active calls 

3.2.16 AT+CIMI Request international mobile subscriber identity 

AT+CIMI Request international mobile subscriber identity 


AT+CIMI=? 


AT+CIMI 

Reference 

GSM 07.07 [13] 

Response 

OK 

Parameters 

Response 

TA returns for identifying the individual SIM which is attached to 

ME. 

+CIMI: OK 


+CME ERROR: 

Parameter 

International Mobile Subscriber Identity (string without 

double quotes) 

3.2.17 AT+CKPD Keypad Control 

AT+CKPD Keypad Control 


AT+ CKPD=? 


Response 

OK 

Parameters 

Response 

AT+CKPD= 

string . *0.1 seconds is the time to stroke each key and 

[,[, *0.1 seconds is the length of pause between two strokes. 

]] 

Keystrokes are emulated. 




Reference 

GSM 07.07 [13] 

OK 


+CME ERROR: 

Parameters 

3.2.18 AT+CLCC List current calls of ME 

AT+CLCC List current calls of ME 


AT+CLCC=? 


AT+CLCC 

string of characters representing keys as listed in the following 


table (based on PCCA STD-101 Annex table I-3): 

Char.: ASCII-Code: Note: 

# 35 hash (number sign) 

* 42 star (*) 

0... 9 48... 57 number keys 

: 58 escape character for manufacturer 

specific keys 

D/d 68/100 volume down 

E/e 69/101 connection end (END) 

R/r 82/114 recall last number (R/RCL/MR) 

S/s 83/115 connection start (SEND) 

U/u 85/117 volume up 

0...255 seconds (default value is manufacturer specific, but 

should be so long that a normal ME can handle 

keystrokes correctly) 

0... 25.5 seconds (default value is manufacturer specific, but 

should be so long that a normal ME can handle keystrokes correctly) 

Response 

OK 

Parameters 

Response 

TA returns a list of current calls of ME. 

Note: If command succeeds but no calls are available, no information 

response is sent to TE. 

[+CLCC: ,,,,[, 

,[,]] 

[+CLCC: ,,,,[, 

,[,]] 

[...]]] OK 


+CME ERROR: 

Parameters 

integer type; call identification number as described in GSM



Reference 

GSM 07.07 

[13][14] 

3.2.19 AT+CLCK Facility lock 

AT+CLCK Facility lock 


AT+CLCK=? 

0 

02.30[19] sub clause 4.5.5.1; this number can be used 

in +CHLD command operations 

mobile originated (MO) call 

1 mobile terminated (MT) call 

state of the call: 

0 active 

1 held 

2 dialing (MO call) 

3 alerting (MO call) 

4 incoming (MT call) 

5 waiting (MT call) 

bearer/tele service: 

0 voice 

1 data 

2 fax 

9 unknown 

0 call is not one of multiparty (conference) call parties 

1 call is one of multiparty (conference) call parties 

string type phone number in format specified by 

type of address of octet in integer format; 






string type alphanumeric representation of 


Response 

+CLCK: (list of supported s) 

OK 

Parameter 






AT+CLCK = 

, 

[, 

[,]] 

Response 

This command is used to lock, unlock or interrogate a ME or a network 

facility . Password is normally needed to do such actions. When 

querying the status of a network service (=2) the response line for 

‘not active’ case (=0) should be returned only if service is not active 

for any . 

If 2 and command is successful 

OK 

If =2 and command is successful 

+CLCK: [,[ 

+CLCK: , class2....]] OK 

Parameter 

"PS" PH-SIM (lock Phone to SIM card) (ME asks password 


when other than current SIM card inserted; ME may 

remember certain amount of previously used cards thus 

not requiring password when they are inserted) 

"SC" SIM (lock SIM card) (SIM asks password in ME 

power-up and when this lock command issued) 

"AO" BAOC (Barr All Outgoing Calls) (refer GSM02.88[6] 

clause 1) 

"OI" BOIC (Barr Outgoing International Calls) (refer 

GSM02.88[6] clause 1) 

"OX" BOIC-exHC (Barr Outgoing International Calls except to 

Home Country) (refer GSM02.88[6] clause 1) 

"AI" BAIC (Barr All Incoming Calls) (refer GSM02.88[6] 

clause 2) 

0 unlock 

"IR" BIC-Roam (Barr Incoming Calls when Roaming outside 

the home country) (refer GSM02.88 [6] clause 2) 

"AB" All Barring services (refer GSM02.30[19]) (applicable 

only for =0) 

"AG" All out Going barring services (refer GSM02.30[19]) 

(applicable only for =0) 

"AC" All in Coming barring services (refer GSM02.30[19]) 


"PN" Network Personalization (refer GSM 02.22[33]) 

"PU" network subset Personalization (refer GSM 02.22[33]) 

"PP" service Provider Personalization (refer GSM 02.22[33]) 

"PC" Corporate Personalization (refer GSM 02.22[33]) 

1 lock 


password 

1 voice 

2 data



Reference 

GSM 07.07 [14] 

4 fax 

7 all classes (default) 

0 off 

1 on 

Note 

3.2.20 AT+CLIP calling line identification presentation 

AT+CLIP Calling line identification presentation 


AT+CLIP? 


AT+CLIP=? 


AT+CLIP= 

Response 

+CLIP: , 

OK 


+CME ERROR: 

Parameters 


Response 

+CLIP: (list of supported s) 

OK 

Parameters 


Response 

TA enables or disables the presentation of the CLI at the TE. It has no effect 

on the execution of the supplementary service CLIP in the network. 

OK 


+CME ERROR: 

Parameters 

0 suppress unsolicited result codes 

1 display unsolicited result codes 

0 CLIP not provisioned 

1 CLIP provisioned 

2 unknown 




Reference 


When the presentation of the CLI at the TE is enabled (and calling 

subscriber allows), an unsolicited result code is returned after every RING 

(or +CRING: ) at a mobile terminating call. 

+CLIP: , , 

Parameter 

string type phone number of calling address in format 

specified by 








string type alphanumeric representation of 

3.2.21 AT+CLIR Calling Line Identification Restriction 

AT+CLIR Calling Line Identification Restriction 


AT+CLIR? 


AT+CLIR=? 


AT+CLIR= 

Response 

+CLIR: , 

OK 



+CME ERROR: 

Parameters 


Response 

+CLIR: (list of supported s) 

OK 

Response 

TA restricts or enables the presentation of the CLI to the called party when 

originating a call. 

The command overrides the CLIR subscription (default is restricted or 

allowed) when temporary mode is provisioned as a default adjustment for 

all following outgoing calls. This adjustment can be revoked by using the 

opposite command. 

OK



Reference 


+CME ERROR: 

Parameters 

(parameter sets the adjustment for outgoing calls): 


0 presentation indicator is used according to the 

subscription of the CLIR service 

1 CLIR invocation 

2 CLIR suppression 

(parameter shows the subscriber CLIR service status in the 

network): 

0 CLIR not provisioned 

3.2.22 AT+CMEE Report mobile equipment error 

AT+CMEE Report mobile equipment error 


AT+CMEE=? 


AT+CMEE? 


AT+CMEE= 

Reference 

GSM 07.07 [13] 

Response 

1 CLIR provisioned in permanent mode 

2 unknown (e.g. no network, etc.) 

3 CLIR temporary mode presentation restricted 

4 CLIR temporary mode presentation allowed 

+CMEE: (list of supported s) OK 

Parameters 


Response 

+CMEE: OK 

Parameters 


Response 

TA disables or enables the use of result code +CME ERROR: as an 

indication of an error relating to the functionality of the ME. 

OK 

Parameters 

0 disable result code 

1 enable result code and use numeric values 

2 enable result code and use verbose values



3.2.23 AT+COLP Connected Line Identification Presentation 

AT+COLP Connected Line Identification Presentation 


AT+COLP? 


AT+COLP=? 


AT+COLP=[ 

] 

Response 

+COLP: , OK 


+CME ERROR: 

Parameters 

See write command 

Response 

+COLP: (list of supported s) OK 

Parameters 


Response 

TA enables or disables the presentation of the COL (Connected Line) at the 

TE for a mobile originated call. It has no effect on the execution of the 

supplementary service COLR in the network. 

Intermediate result code is returned from TA to TE before any +CR or 

V.25ter responses. 

OK 

Parameters 

(parameter sets/shows the result code presentation status in the 

TA): 

0 disable 

1 enable 

(parameter shows the subscriber COLP service status in the 

Intermediate result code 

network): 

0 COLP not provisioned 

1 COLP provisioned 

2 unknown (e.g. no network, etc.) 

When enabled (and called subscriber allows), an intermediate result code is 

returned before any +CR or V.25ter responses: 

+COLP:,[,, [,]] 




Reference 

Parameters 

3.2.24 AT+COPS Operator selection 

AT+COPS Operator selection 


AT+COPS=? 


AT+COPS? 

string type phone number of format specified by 








string type sub address of format specified by 

type of sub address octet in integer format (refer GSM 

04.08 [8] sub clause 10.5.4.8) 

optional string type alphanumeric representation of 

Response 

corresponding to the entry found in phone 

book 

TA returns a list of quadruplets, each representing an operator present in 

the network. Any of the formats may be unavailable and should then be an 

empty field. The list of operators shall be in order: home network, 

networks referenced in SIM, and other networks. 

+COPS: list of supported(, long alphanumeric , numeric 

)s [,,(list of supported s),(list of supported s)] OK 


+CME ERROR: 

Parameters 


Response 

TA returns the current mode and the currently selected operator. If no 

operator is selected, and are omitted. 

+COPS: [, [, ]] OK 


+CME ERROR: 

Parameters 





AT+COPS = 

 

[, [, 

]] 

Reference 

GSM 07.07 [14] 

Response 

TA forces an attempt to select and register the GSM network operator. If 

the selected operator is not available, no other operator shall be selected 

(except =4). The selected operator name format shall apply to 

further read commands (+COPS?). 

OK 


+CME ERROR: 

Parameters 

0 unknown 

1 operator available 

2 operator current 

3 operator forbidden 

operator in format as per 

0 automatic mode; field is ignored 


1 manual operator selection; field shall be present 

2 manual deregister from network 

3 set only (for read command +COPS?) – not 

shown in Read command response 

4 manual/automatic selected; if manual selection fails, 

automatic mode (=0) is entered 

0 long format alphanumeric ;can be up to 16 

characters long 

1 short format alphanumeric 

2 numeric ; GSM Location Area Identification 

number 

3.2.25 AT+CPAS Mobile equipment activity status 

AT+CPAS Mobile equipment activity status 


AT+CPAS=? 


AT+CPAS 

Response 

+CPAS: (list of supported s) OK 

Parameters 


Response 

TA returns the activity status of ME. 

+CPAS: OK 


+CME ERROR:



Reference 

GSM 07.07 [13] 

Parameters 

3.2.26 AT+CPBF Find phone book entries 

AT+CPBF Find phone book entries 


AT+CPBF=? 


AT+CPBF= 

0 ready 

2 unknown (ME is not guaranteed to respond to 

instructions) 

3 incoming call (ringing) 

4 call in progress or call hold 

Response 

+CPBF: [maximum length of field



Reference 

GSM 07.07 [13] 

Note 

3.2.27 AT+CPBR Read current phone book entries 

AT+CPBR Read current phone book entries 


AT+CPBR=? 


AT+CPBR= 

 

[, ] 

Reference 

GSM 07.07 [13] 

Response 

TA returns location range supported by the current storage as a compound 

value and the maximum lengths of and fields. 

+CPBR: (list of supported s), , 

OK 

Parameter 

location number 

max. length of phone number 

max. length of text for number 

Response 

TA returns phone book entries in location number range ... 

from the current phone book memory storage selected with 

+CPBS. If is left out, only location is returned. 

+CPBR: , , , 

[+CPBR: .....+CPBR: , , , 

] 

OK 

Parameter 

read as of this location number 

read to this location number 

phone number 

type of number 

ext for phone number in current TE character set specified by 

Note 

+CSCS. 

3.2.28 AT+CPBS Select phone book memory storage 

AT+CPBS Select phone book memory storage 


AT+CPBS=? 

Response 

+CPBS: (list of supported s) 

OK 

Parameter 






AT+CPBS? 


AT+CPBS= 

Reference 

GSM 07.07 [13] 

Response 

+CPBS: 

OK 

Parameter 


Response 

TA selects current phone book memory storage, which is used by other 

phone book commands. 

OK 

Parameter 

"MC" ME missed (unanswered) calls list 

Note 

3.2.29 AT+CPBW Write phone book entry 

AT+CPBW Write phone book entry 


AT+CPBW=? 

Response 

"RC" ME received calls list 


"DC" ME dialed calls list(+CPBW may not be applicable 

or this storage)(same as LD) 

"LA" Last Number All list (LND/LNM/LNR) 

"ME" ME phonebook 

"BN" SIM barred dialed number 

"SD" SIM service dial number 

"VM" SIM voice mailbox 

"FD" SIM fix dialing-phone book 

"LD" SIM last-dialing-phone book 

"ON" SIM (or ME) own numbers (MSISDNs) list 

"SM" SIM phonebook 

TA returns location range supported by the current storage, the maximum 

length of field, supported number formats of the storage, and the 

maximum length of field. 

+CPBW: (list of supported s), , (list of supported s), 

 

OK 

Parameter 

see execution command




AT+CPBW= 

 

[, , 

[, 

[]]] 

Reference 

GSM 07.07 [13] 

Response 

TA writes phone book entry in location number in the current 

phone book memory storage selected with +CPBS. Entry fields written are 

phone number (in the format ) and text associated 

with the number. If those fields are omitted, phone book entry is deleted. If 

is left out, but is given, entry is written to the first free 

location in the phone book. 

OK 

Parameter 

max. length of phone number 

max. length of text for number 

location number 

phone number 

type of number; 







text for phone number in current TE character set specified 

by +CSCS. 

Note: The following characters in must be entered via the 

Note 

3.2.30 AT+CPIN Enter PIN 

AT+CPIN Enter PIN 


AT+CPIN=? 

Response 

OK 

Parameter 

escape sequence: 


GSM char. Seq. Seq.(hex) Note 

\ \5C 5C 35 43 (backslash) 

“ \22 5C 32 32 (string delimiter) 

BSP \08 5C 30 38 (backspace) 

NULL \00 5C 30 30 (GSM null) 

‘0’ (GSM null) may cause problems for application layer 

software when reading string lengths.



Execution 

command 

AT+CPIN? 


AT+CPIN= 

[, ] 

Reference 

GSM 07.07 [13] 

Response 

TA returns an alphanumeric string indicating whether some password is 

required or not. 

+CPIN: 

OK 

Parameter 

READY no further entry needed 

SIM PIN ME is waiting for SIM PIN 

SIM PUK ME is waiting for SIM PUK 

PH_SIM PIN ME is waiting for phone to SIM card (antitheft) 

PH_SIM PUK ME is waiting for SIM PUK (antitheft) 

SIM PIN2 PIN2, e.g. for editing the FDN book possible only 

if preceding command was acknowledged with +CME ERROR:17 

SIM PUK2 possible only if preceding command was acknowledged 

with error +CME ERROR: 18. 

Response 

TA stores a password which is necessary before it can be operated (SIM 

PIN, SIM PUK, PH-SIM PIN, etc.). If the PIN is to be entered twice, the TA 

shall automatically repeat the PIN. If no PIN request is pending, no action is 

taken and an error message, +CME ERROR, is returned to TE. 

If the PIN required is SIM PUK or SIM PUK2, the second pin is required. 

This second pin, , is used to replace the old pin in the SIM. 

OK 

Parameter 

string type; password 

string type; If the PIN required is SIM PUK or 

SIMPUK2: new password 

Note 

3.2.31 AT+CPWD Change password 

AT+CPWD Change password 


AT+CPWD=? 

Response 

TA returns a list of pairs which present the available facilities and the 

maximum length of their password. 

+CPWD: list of supported (, )s 

OK 

Parameter 

 

otherwise see execution command, without "FD" 

integer max. length of password 




Execution 

command 

AT+CPWD = 

, 

[], 

 

Reference 

GSM 07.07 [13] 

Response 

TA sets a new password for the facility lock function. 

OK 

Parameter 

 


"SC" SIM (lock SIM card) (SIM asks password in ME 

power-up and when this lock command issued) 

"AO" BAOC (Barr All Outgoing Calls) (refer GSM02.88[6] 

clause 1) 

"OI" BOIC (Barr Outgoing International Calls) (refer 

GSM02.88[6] clause 1) 

"OX" BOIC-exHC (Barr Outgoing International Calls except to 

Home Country) (refer GSM02.88[6] clause 1) 

"AI" BAIC (Barr All Incoming Calls) (refer GSM02.88[6] 

clause 2) 

"IR" BIC-Roam (Barr Incoming Calls when Roaming outside 

the home country) (refer GSM02.88 [6] clause 2) 

"AB" All Barring services (refer GSM02.30[19]) (applicable 

only for =0) 

"AG" All outgoing barring services (refer GSM02.30[19]) 


"AC" All incoming barring services (refer GSM02.30[19]) 


"P2" SIM PIN2 password specified for the 

facility from the user interface or with command. If an 

old password has not yet been set, is not to 

enter. 

new password 

Note 

3.2.32 AT+CR Service Reporting Control 

AT+CR Service Reporting Control 


AT+CR=? 


AT+CR? 

Response 

+CR: list of supported s 

OK 

Parameters 


Response 

+CR: 

OK




AT+CR= 

Reference 

GSM 07.07 [13] 

Parameters 


Response 

TA controls whether or not intermediate result code +CR: is 

returned from the TA to the TE at a call set up. 

OK 

Parameters 

0 disable 

1 enable 

Intermediate result code 

If enabled, an intermediate result code is transmitted at the point during 

connect negotiation at which the TA has determined which speed and 

quality of service will be used, before any error control or data 

compression reports are transmitted, and before any final result code (e.g. 

CONNECT) is transmitted. 

+CR: 

Parameters 

ASYNC asynchronous transparent 


SYNC synchronous transparent 

REL ASYNC asynchronous non-transparent 

REL SYNC synchronous non-transparent 

3.2.33 AT+CRC Set Cellular Result Codes for incoming call indication 

AT+CRC Set Cellular Result Codes for incoming call indication 


AT+CRC=? 


AT+CRC? 


AT+CRC= 

Response 

+CRC: list of supported s 

OK 

Parameters 


Response 

+CRC: 

OK 

Parameters 


Response 

TA controls whether or not the extended format of incoming call 

indication is used. 

OK 

Parameters 

0 disable extended format 

1 enable extended format



Reference 

GSM 07.07 [13] 


When enabled, an incoming call is indicated to the TE with unsolicited 

result code +CRING: 

instead of the normal RING. 

Parameters 

3.2.34 AT+CREG Network registration 

AT+CREG Network registration 


AT+CREG=? 


AT+CREG? 


AT+CREG=[] 

ASYNC asynchronous transparent 

SYNC synchronous transparent 

REL ASYNC asynchronous non-transparent 

REL SYNC synchronous non-transparent 

FAX facsimile 

VOICE voice 

Response 

+CREG: list of supported s OK 

Parameters 


Response 

TA returns the status of result code presentation and an integer 

which shows whether the network has currently indicated the registration 

of the ME. Location information elements and are returned 

only when =2 and ME is registered in the network. 

+CREG: ,[,,] OK 


+CME ERROR: 

Response 

TA controls the presentation of an unsolicited result code +CREG: 

when =1 and there is a change in the ME network registration status. 

OK 




Reference 

GSM 07.07 [13] 

Parameters 

0 disable network registration unsolicited result code 

1 enable network registration unsolicited result code 

+CREG: 


2 enable network registration unsolicited result code with 

location information 

0 not registered, ME is not currently searching a new 


operator to register to 

1 registered, home network 

2 not registered, but ME is currently searching a new 

operator to register to 

3 registration denied 

4 unknown 

5 registered, roaming 

When =1 and there is a change in the ME network registration status: 

Parameters 


+CREG: 

3.2.35 AT+CRLP Select Radio Link Protocol parameter 

AT+CRLP Select Radio Link Protocol parameter 


AT+CRLP=? 


AT+CRLP? 

Response 

TA returns values supported. RLP versions 0 and 1 share the same 

parameter set. TA returns only one line for this set (where is not 

present). 

+CRLP: (list of supported s), (list of supported s), (list of 

supported s), (list of supported s), (list of supported s), 

(list of supported s) 

... 

OK 

Parameters 


Response 

TA returns current settings for RLP version. RLP versions 0 and 1 share 

the same parameter set. TA returns only one line for this set (where 

is not present). 

+CRLP: ,,,,, 

... 

OK




AT+CRLP=[[,[,[ 

,[,[,]]]]]] 

Reference 

GSM 07.07 [13] 

Parameters 


Response 

TA sets radio link protocol (RLP) parameters used when non-transparent 

data calls are setup. 

OK 

Parameters 

3.2.36 AT+CRSM Restricted SIM access 

AT+CRSM Restricted SIM access 


AT+CRSM=? 

Write command 

AT+CRSM=[, 

[,,, 

[,]]] 

0-61-255 Interworking window size (IWF to MS) 

0-61-255 Mobile window size(MS to IWF) 

0-48-255 acknowledgment timer T1 in 10 ms units) 

0-6-255 retransmission attempts N2 

0-1 RLP version number in integer format; when 

Version indication is not present it shall equal 0. 

Note: Versions 0 and 1 share the same parameter set. 

0-3-255 re-sequencing period in integer format, in units of 

10 ms. This is NOT used for RLP versions 0 and 

1. 

Response 

OK 

Response 

+CRSM: , [,] 

OK / ERROR / +CME ERROR: 

Parameter 

176 READ BINARY 

178 READ RECORD 

192 GET RESPONSE 

214 UPDATE BINARY 

220 UPDATE RECORD 

242 STATUS 

all other values are reserved; refer GSM 11.11. 

integer type; this is the identifier for an elementary 

data file on SIM. Mandatory for every command except STATUS 

,, integer type, range 0 - 255 

parameters to be passed on by the ME to the SIM; refer GSM 11.11. 

information which shall be written to the SIM (hex- 

decimal character format) 

, integer type, range 0 - 255 




Reference 

GSM 07.07 

GSM 11.11 

3.2.37 AT+CSQ Signal Quality Report l 

AT+CSQ Signal Quality Report l 


AT+CSQ=? 


AT+CSQ 

Reference 

GSM 07.07 [13] 

status information from the SIM about the execution 

of the actual command. These parameters are delivered to the TE in both 

cases, on successful or failed execution of the command; refer GSM 11.11. 

response of a successful completion of the command 

previously issued (hexadecimal character format) 

Response 

+CSQ: (list of supported s),(list of supported s) 

Response 

+CSQ: , 

+CME ERROR: 

Execution command returns received signal strength indication and 

channel bit error rate from the ME. Test command returns values 

supported by the TA. 

Parameters 

: 

0 -113 dBm or less 

1 -111 dBm 

2...30 -109... -53 dBm 

31 -51 dBm or greater 

99 not known or not detectable 

(in percent): 

0...7 as RXQUAL values in the table in GSM 05.08 [20] subclause 8.2.4 

99 not known or not detectable 

Note 

3.2.38 AT+FCLASS Select mode 

AT+FCLASS Select mode 


AT+FCLASS=? 

Response 

+FCLASS: list of supported s) 

OK 

Parameter 






AT+ FCLASS? 


AT+FCLASS= 

 

Reference 

GSM 07.07 [13] 

Response 

+ FCLASS: 

OK 

Parameter 


Response 

TA sets a particular mode of operation (data fax). This causes the TA to 

process information in a manner suitable for that type of information 

OK 

Parameter 

0 data 

Note 

1 fax class 1 (TIA-578-A) 

3.2.39 AT+FMI FAX: select read or test service class 

AT+FMI FAX: select read or test service class 


AT+ FMI =? 


AT+ FMI 

Reference 

EIA/TIA-578-D 

Response 

OK 

Parameter 


Response 


identify the manufacturer. 

 

OK 

Parameter 

 

Note 

3.2.40 AT+FMM FAX: report model ID 

AT+FMM FAX: report model ID 


AT+ FMM =? 


AT+ FMM 

Response 

OK 

Parameter 


Response 


identify the specific model of device. 

 

OK 




Reference 

EIA/TIA-578-D 

Parameter 

 

Note 

3.2.41 AT+FMR FAX: report revision ID 

AT+FMR FAX: report revision ID 


AT+ FMR =? 


AT+ FMR 

Reference 

EIA/TIA-578-D 

Response 

OK 

Parameter 


Response 


identify the version, revision level or data or other information of the 

device. 

 

OK 

Parameter 

 

Note 

3.2.42 AT+VTD= Tone duration 

AT+VTD= Tone duration 


AT+VTD=? 


AT+VTD? 


AT+VTD = 

 

Response 

+VTD: list of supported s OK 

Parameters 


Response 

+VTD: OK 

Parameters 


Response 

This command refers to an integer that defines the length of tones 

emitted as a result of the +VTS command. This does not affect the D 

command. 

OK 

Parameters 

 


0 default setting 

1-255 duration of the tone in 1/10 seconds



Reference 

GSM 07.07 [13] 

Note 

3.2.43 AT+VTS DTMF and tone generation 

AT+VTS DTMF and tone generation 


AT+VTS=? 


AT+VTS= 

Reference 

GSM 07.07 [13] 

Response 

+VTS: list of supported s, list of supported s OK 

Parameters 


Response 

This command allows the transmission of DTMF tones and arbitrary 

tones in voice mode. These tones may be used (for example) when 

announcing the start of a recording period. 

OK 

Note: D is used only for dialing. 


+CME ERROR: 

Note: The command is writing only. 

Parameters 

which has a max length of 20 characters, must be entered 

between double quotes (“ “) and consists of combinations of the following 

separated by commas: 

1) A single ASCII characters in the set 0-9, #,*, A-D. This is 

interpreted as a sequence of DTMF tones whose duration is set by the +VTD 


2) {, } This is interpreted as a DTMF tone whose duration 

is determined by . 

duration of the tone in 1/10 seconds range :1-255 

Note 

3.2.44 AT+CMUX Serial Multiplexer control 

AT+CMUX Serial Multiplexer control 


AT+CMUX=? 


AT+CMUX=



ode>[,[, 

[,< 

N1>[,[,[,[,[, 

]]]]]]]] 


AT+CMUX ? 

Reference 

GSM 07.07 [13] 

Parameters 

0 Basic option (i.e. No multiplexer in operation) 

1 Advanced option (GSM 07.10 multiplexer) 

 

2 Proprietary option (manufacturer specific multiplexer) 

Response: 

+CMUX: (mode-1),0,5,127,10,3,30,10,2 

OK 

ERROR 

Note 

3.2.45 AT+CNUM Subscriber Number 

AT+CNUM Subscriber Number 


AT+CNUM=? 


AT+CNUM 

Channel Number Type DLCI 

None Multiplexer Control 0 

1 07.07 and 07.05 1 




Response 

Response 

+CNUM: [],,[,,[,]] 

[+CNUM: [],,[,, [, 

]] 

[...]] 

+CME ERROR: 

Parameters 

optional alphanumeric string associated with ; 

used 


character set should be the one selected with command 

Select TE Character Set +CSCS 

string type phone number of format specified by 

type of address octet in integer format (refer GSM 04.08 [8] 

subclause 10.5.4.7) 

as defined by the +CBST command 

(service related to the phone number: ) 

0 asynchronous modem 

1 synchronous modem 

2 PAD Access (asynchronous) 

3 Packet Access (synchronous) 

4 Voice 

5 Fax



Reference 

GSM 07.07 [13] 

(information transfer capability: ) 

Note 

0 3.1 kHz 

1 UDI 

3.2.46 AT+CPOL Preferred operator list 

AT+CPOL Preferred operator list. 


AT+CPOL=? 


AT+CPOL? 


AT+CPOL=[][,[, 

]] 

Reference 

GSM 07.07 [13] 

Response 

+CPOL: (list of supported s),(list of supported s) 

Parameters 


Response 

+CPOL: ,, 

[+CPOL: ,, 

[…]] 

+CME ERROR: 

Parameter 

See set command 

Response 

+CME ERROR: 

Parameters 

integer type: order number of operator in SIM preferred 

operator list 

0 long format alphanumeric 


1 short format alphanumeric 

2 numeric 

string type: indicates whether alphanumeric or 

numeric 

Note 

format used (see +COPS command) 

3.2.47 AT+COPN Read operator names. 

AT+COPN Read operator names. 


AT+COPN=? 

Response




AT+COPN 

Reference 

GSM 07.07 [13] 

Response 

+COPN: , 

[+COPN: , 

[…]] 

+CME ERROR: 

Parameters 

string type: operator in numeric format (see +COPS) 

string type: operator in long alphanumeric format (see +COPS) 

Note 

3.2.48 AT+CFUN Set phone functionality. 

AT+CFUN Set phone functionality. 


AT+CFUN=? 


AT+CFUN? 


AT+CFUN=,[] 

Reference 

GSM 07.07 [13] 

Response 

+CFUN: (list of supported s), (list of supported s) 

+CME ERROR: 

Parameters 


Response 

+CFUN: 

+CME ERROR: 

Parameter 


Response 

+CME ERROR: 

Parameters 

0 minimum functionality 

1 full functionality (Default) 


4 disable phone both transmit and receive RF circuits 

: 0 Set the ME to power level immediately. This is 

Note 

the default when is not given. 

1 Set the ME to power level after the ME been 

reset.



3.2.49 AT+CCLK Clock 

AT+CCLK Clock 


AT+CCLK=? 


AT+CCLK? 


Response 

Parameters 

Response 

+CCLK: 

+CME ERROR: 

Parameter 


Response 

AT+CCLK= Parameters 

Reference 

GSM 07.07 [13] 

string type value; format is "yy/MM/dd,hh:mm:ss+/-time zone 

Note 

3.2.50 AT+CSIM Generic SIM Access 

AT+CSIM Generic SIM Access 


AT+CSIM=? 


AT+CSIM=, 

Reference 

GSM 07.07 [13] 

Response 

Parameters 

Response 


(two digits)”; where characters indicate year (two last digits), 

month, day, hour, minutes, seconds and time zone. E.g: 

22:10:00+00 GMT equals to "94/05/06,22:10:00+00" 

The value scope of “time zone (two digits)” is: 00 – 48. The 

interval between each time zone is 15 minutes. 

+CSIM: , 

+CME ERROR: 

Parameters 

integer type: length of characters sent to the TE in 

or 

(i.e. twice the number of octets in the raw data) 

string type: hex format: GSM 11.11 SIM command sent from 

the 

ME to the SIM 

string type: hex format: GSM 11.11 response from SIM to 

Note 



3.2.51 AT+CALM Alert Sound Mode 

AT+CALM Alert Sound Mode 


AT+CALM=? 


AT+CALM? 


AT+CALM= 

Reference 

GSM 07.07 [13] 

Response 

+CALM: (list of supported s) 

+CME ERROR: 

Parameter 


Response 

+CALM: 

+CME ERROR: 

Parameter 


Response 

+CME ERROR: 

Parameters 

0 normal mode 

1 silent mode (all sounds from ME are prevented) 

Note 

3.2.52 AT+CRSL Ringer Sound Level 

AT+CRSL Ringer Sound Level 


AT+CRSL? 


AT+CRSL= 

Reference 

GSM 07.07 [13] 

Response 

+CRSL: 

+CME ERROR: 

Parameter 


Response 

+CME ERROR: 

Parameters 

integer type value(0-100) with manufacturer specific range 

Note 

(smallest value 

represents the lowest sound level) 




3.2.53 AT+CLVL Loud speaker volume level 

AT+CLVL Loud speaker volume level 


AT+CLVL=? 


AT+CLVL? 


Response 

+CLVL: (list of supported s) 

+CME ERROR: 

Parameters 


Response 

+CLVL: 

+CME ERROR: 

Parameter 


Response 

AT+CLVL=



3.2.55 AT+CPUC Price per Unit and Currency Table 

AT+CPUC Price Per Unit and Currency Table 


AT+CPUC=? 


AT+CPUC? 


AT+CPUC=,[,< 

passwd>] 

Reference 

GSM 07.07 [13] 

Response 

Parameters 


Response 

+CPUC: , 

+CME ERROR: 

Parameter 


Response 

+CME ERROR: 

Parameters 

string type; three-character currency code (e.g. "GBP", 

"DEM"); 


character set as specified by command Select TE Character 

Set +CSCS 

string type; price per unit; dot is used as a decimal separator 

(e.g. "2.66") 

string type; SIM PIN2 

Note 

3.2.56 AT+CCWE Call Meter Maximum Event 

AT+CCWE Call Meter Maximum Event 


AT+CCWE=? 


AT+CCWE? 


Response 

+CCWE: (list of supported s) 

+CME ERROR: 

Parameters 


Response 

+CCWE: 

+CME ERROR: 

Parameter 


Response 

AT+CCWE= Parameters 

0 Disable call meter warning event 

1 Enable call meter warning event



Reference 

GSM 07.07 [13] 

Unsolicited result codes supported: 

+CCWV Shortly before the ACM (Accumulated Call Meter) maximum 

value is reached, an unsolicited result code +CCWV will be 

sent, if enabled by this command. The warning is issued 

approximately when 5 seconds call time remains. It is also 

issued when starting a call if less than 5 s call time remains. 

Parameters 

Note 

3.2.57 AT+CBC Battery charge 

AT+ CBC Battery charge 


AT+CBC=? 


AT+CBC? 


AT+CBC 

Reference 

GSM 07.07 [13] 

GSM 07.07 specifies 30 seconds, so SIMCOM deviate from the specification. 

Response 

+CBC: (list of supported < bcs >s),(list of supported < bcl 

>s),(voltage) 

Parameters 


Response 

ERROR 

Parameter 


Response 

+CBC: < battery connected status >, < battery charging level >, 

+CME ERROR: 

Parameters 

charge status 

0 ME is not charged 

1 ME is charging 

battery connection level 


0 battery is exhausted, or ME does not have a battery 

connected 

1...100 battery has 1-100 percent of capacity remaining vent 

battery voltage(mV) 

Note 

Support for this command will be hardware dependant and only be used 

when battery is set to vibrator



3.2.58 AT+CUSD Unstructured supplementary service data 

AT+ CUSD Unstructured supplementary service data 


AT+CUSD=? 


AT+CUSD? 


AT+CUSD=[ 

[,[,]] 

Reference 

GSM 03.38 [25] 

Response 

+CUSD: 

Parameters 


Response 

+CUSD: 

Parameter 

 

Response 

OK 

ERROR 

Parameters 

a numeric parameter which indicates control of the unstructured 

supplementary service data 


0 disable the result code presentation in the TA 

1 enable the result code presentation in the TA 

2 cancel session (not applicable to read command response) 

string type USSD-string 

Cell Broadcast Data Coding Scheme in integer format (default 0) 

Note 

3.2.59 AT+CSSN SUPPLEMENTARY SERVICES NOTIFICATION 

AT+ CSSN SUPPLEMENTARY SERVICES NOTIFICATION 


AT+CSSN=? 


AT+CSSN? 


AT+CSSN=[ 

[,]] 

Response 

+CSSN: (list of supported s), (list of supported s) 

Parameters 


Response 

+CSSN:, 

Parameter 


Response 

OK 

ERROR



Reference 

Parameters 

a numeric parameter which indicates whether to show the +CSSI 

result code presentation status after a mobile originated call setup 

0 disable 

1 enable 

a numeric parameter which indicates whether to show the 

+CSSU result code presentation status during a mobile 

terminated call setup or during a call, or when a forward check 

supplementary service notification is received. 

0 disable 

1 enable 

Note 

4 AT Commands According to GSM07.05 

The GSM 07.05 commands are for performing SMS and CBS related operations. SIM300D II 

supports both Text and PDU modes. 

4.1 Overview of AT Commands According to GSM07.05 


AT+CMGD DELETE SMS MESSAGE 

AT+CMGF SELECT SMS MESSAGE FORMAT 

AT+CMGL LIST SMS MESSAGES FROM PREFERRED STORE 

AT+CMGR READ SMS MESSAGE 

AT+CMGS SEND SMS MESSAGE 

AT+CMGW WRITE SMS MESSAGE TO MEMORY 

AT+CMSS SEND SMS MESSAGE FROM STORAGE 

AT+CMGC SEND SMS COMMAND 

AT+CNMI NEW SMS MESSAGE INDICATIONS 

AT+CPMS PREFERRED SMS MESSAGE STORAGE 

AT+CRES RESTORE SMS SETTINGS 

AT+CSAS SAVE SMS SETTINGS 

AT+CSCA SMS SERVICE CENTER ADDRESS 

AT+CSCB SELECT CELL BROADCAST SMS MESSAGES 

AT+CSDH SHOW SMS TEXT MODE PARAMETERS 

AT+CSMP SET SMS TEXT MODE PARAMETERS 

AT+CSMS SELECT MESSAGE SERVICE 




4.2 Detailed Descriptions of AT Commands According to GSM07.05 

4.2.1 AT+CMGD Delete SMS message 

AT+CMGD Delete SMS message 


AT+CMGD=? 


AT+CMGD= 

Reference 

GSM 07.05 

Response 

+CMGD: 

OK 

Response 

TA deletes message from preferred message storage location 

. 

OK 


+CMS ERROR 

Parameters 

integer type; value in the range of location numbers supported by 

the associated memory 

4.2.2 AT+CMGF Select SMS Message Format 

AT+CMGF Select SMS Message Format 


AT+CMGF? 


AT+CMGF=? 


AT+CMGF=[] 

Reference 

GSM 07.05 

Response 

+CMGF: 

OK 

Parameters 


Response 

+CMGF: list of supported s 

OK 

Response 

TA sets parameter to denote which input and output format of messages to 

use. 

OK 

Parameters 

0 PDU mode 

1 text mode 

4.2.3 AT+CMGL List SMS messages from preferred store 

AT+CMGL List SMS messages from preferred store 





AT+CMGL=? 


AT+CMGL=[] 

Response 

+CMGL: list of supported s 

OK 

Parameters 


Parameters 

1) If text mode: 

"REC UNREAD" Received unread messages (default) 

2) If PDU mode: 


"REC READ" Received read messages 

"STO UNSENT" Stored unsent messages 

"STO SENT" Stored sent messages 

"ALL" All messages 

0 Received unread messages (default) 

Response 

1 Received read messages 

2 Stored unsent messages 

3 Stored sent messages 

4 All messages 

TA returns messages with status value from message storage 

to the TE. . If status of the message is 'received unread', status in 

the storage changes to 'received read'. 

1) If text mode (+CMGF=1) and command successful: 

for SMS-SUBMITs and/or SMS-DELIVERs: 

+CMGL: 

,,,[],[][,,]< 

LF>[ 

+CMGL: 

,,,[],[][,,]< 

LF>[...]] 

OK 

2) If PDU mode (+CMGF=0) and command successful: 

+CMGL:,,[], 

+CMGL: ,,[alpha],[...]] 

OK 

3)If error is related to ME functionality: 

+CMS ERROR: 

Parameters 

string type alphanumeric representation of or 

corresponding to the entry found in MT phonebook; 

implementation of this feature is manufacturer specific 

GSM 03.40 TP-Destination-Address Address-Value field in




string format; BCD numbers (or GSM default alphabet 

characters) are converted to characters; type of address 

given by 

In the case of SMS: GSM 03.40 TP-User-Data in text mode 

responses; format: 

-if indicates that GSM 03.38 default alphabet is used and 

indicates that GSM 03.40 

TP-User-Data-Header-Indication is not set: ME/TA 

converts GSM alphabet into current TE character set 

according to rules of Annex A 

-if indicates that 8-bit or UCS2 data coding scheme is 

used, or indicates that GSM 03.40 

TP-User-Data-Header-Indication is set: ME/TA converts 

each 8-bit octet into two IRA character long hexadecimal 

number (e.g. octet with integer value 42 is presented to 

TE as two characters 2A (IRA 50 and 65)) 

In the case of CBS: GSM 03.41 CBM Content of Message in 

text mode responses; format: 

- if indicates that GSM 03.38 default alphabet is used: 

ME/TA converts GSM alphabet into current TE character 

set according to rules of Annex A 


used: ME/TA converts each 8-bit octet into two IRA 

character long hexadecimal number 

integer type value indicating in the text mode (+CMGF=1) the 

length of the message body (or ) in 

characters; or in PDU mode (+CMGF=0), the length of 

the actual TP data unit in octets (i.e. the RP layer SMSC 

address octets are not counted in the length) 



GSM 03.40 TP-Originating-Address Address-Value field in 


characters) are converted to characters; type of address 

given by 

In the case of SMS: GSM 04.11 SC address followed by GSM 

03.40 TPDU in hexadecimal format: ME/TA converts 

each octet of TP data unit into two IRA character long 

hexadecimal number (e.g. octet with integer value 42 is 

presented to TE as two characters 2A (IRA 50 and 65)). 

In the case of CBS: GSM 03.41 TPDU in hexadecimal 

format. 

GSM 03.40 TP-Service-Center-Time-Stamp in time-string 

format (refer ) 

GSM 04.11 TP-Destination-Address Type-of-Address octet in



Reference 

GSM 07.05 

4.2.4 AT+CMGR Read SMS message 

AT+CMGR Read SMS message 


AT+CMGR=? 


AT+CMGR=[,] 


integer format (when first character of is + (IRA 43) 

default is 145, otherwise default is 129) 

GSM 04.11 TP-Originating-Address Type-of-Address octet 

Response 

OK 

Parameters 

in integer format (default refer) 



0 normal 

Response 

1 not change status of the specified SMS record 

TA returns SMS message with location value from message storage 

to the TE. If status of the message is 'received unread', status in the 

storage changes to 'received read'. 

1) If text mode (+CMGF=1) and command successful: 

for SMS-DELIVER: 

+CMGR:,,[],[,,,,,,,] 

for SMS-SUBMIT: 

+CMGR:,,[][,,,,,[],,,] 

2) If PDU mode (+CMGF=0) and command successful: 

+CMGR: ,[], 

OK 

3) If error is related to ME functionality: 

+CMS ERROR: 

Parameters 

string type alphanumeric representation of or 

corresponding to the entry found in MT phonebook; 

implementation of this feature is manufacturer specific 

GSM 03.40 TP-Destination-Address Address-Value field in 


characters) are converted to characters of the currently 

selected TE character set (specified by +CSCS); type of 

address given by 

In the case of SMS: GSM 03.40 TP-User-Data in text mode 

responses; format: 

-if indicates that GSM 03.38 default alphabet is used and




indicates that GSM 03.40 

TP-User-Data-Header-Indication is not set: 

ME/TA converts GSM alphabet into current TE 

character set according to rules of Annex A 


used, or indicates that GSM 03.40 

TP-User-Data-Header-Indication is set: ME/TA converts 

each 8-bit octet into two IRA character long hexadecimal 

number (e.g. octet with integer value 42 is presented to 

TE as two characters 2A (IRA 50 and 65)) 

In the case of CBS: GSM 03.41 CBM Content of Message in 

text mode responses; format: 

- if indicates that GSM 03.38 default alphabet is used: 

ME/TA converts GSM alphabet into current TE character 

set according to rules of Annex A 


used: ME/TA converts each 8-bit octet into two IRA 

character long hexadecimal number 

depending on the command or result code: GSM 03.38 SMS 

Data Coding Scheme (default 0), or Cell Broadcast Data 

Coding Scheme in integer format 

depending on the command or result code: first octet of GSM 

03.40 SMS-DELIVER, SMS-SUBMIT (default 17), 

SMS-STATUS-REPORT, or SMS-COMMAND (default 

2) in integer format 




the actual TP data unit in octets (i.e. the RP layer SMSC 

address octets are not counted in the length) 

GSM 03.41 CBM Message Identifier in integer format 



characters) are converted characters of the currently 

selected TE character set (specified by +CSCS);; type of 


In the case of SMS: GSM 04.11 SC address followed by GSM 

03.40 TPDU in hexadecimal format: ME/TA converts 

each octet of TP data unit into two IRA character long 

hexadecimal number (e.g. octet with integer value 42 is 

presented to TE as two characters 2A (IRA 50 and 65)). 

In the case of CBS: GSM 03.41 TPDU in hexadecimal 

format. 

GSM 04.11 RP SC address Address-Value field in string format; 

BCD numbers (or GSM default alphabet characters) are



Reference 

GSM 07.05 

4.2.5 AT+CMGS Send SMS message 

AT+CMGS Send SMS message 


AT+CMGS=? 


are converted to characters of the currently selected TE 

character set (specified by +CSCS);; type of address 

given by 

GSM 03.40 TP-Service-Centre-Time-Stamp in time-string 

format (refer ) 

0 "REC UNREAD" Received unread messages 

1 "REC READ" Received read messages 

2 "STO UNSENT" Stored unsent messages 

3 "STO SENT" Stored sent messages 

4 "ALL" All messages 

GSM 04.11 TP-Destination-Address Type-of-Address octet in 

integer format (when first character of is + (IRA 43) 

default is 145, otherwise default is 129) 

GSM 04.11 TP-Originating-Address Type-of-Address octet in 

integer format (default refer) 

GSM 04.11 RP SC address Type-of-Address octet in integer 

format (default refer ) 

depending on SMS-SUBMIT setting: GSM 03.40 

Response 

OK 

TP-Validity-Period either in integer format (default 167) or in 

time-string format (refer )




1) If text mode 

(+CMGF=1): 

+CMGS=[,< 

toda>] 

text is entered 

 

ESC quits without 

sending 

2) If PDU mode 

(+CMGF=0): 

+CMGS= 

PDU is given 

 

Reference 

GSM 07.05 

Parameters 





selected TE character set (specified by +CSCS);; type 

of address given by 

GSM 04.11 TP-Destination-Address 

Type-of-Address octet in integer format 







Response 



the actual TP data unit in octets (i.e. the RP layer 

SMSC address octets are not counted in the length) 

TA transmits SMS message from a TE to the network (SMS-SUBMIT). 

Message reference value is returned to the TE on successful message 

delivery. Value can be used to identify message upon unsolicited delivery 

status report result code. 

1) If text mode(+CMGF=1) and sending successful: 

+CMGS: 

OK 

2) If PDU mode(+CMGF=0) and sending successful: 

+CMGS: 

OK 


+CMS ERROR: 

Parameters 

GSM 03.40 TP-Message-Reference in integer format 

4.2.6 AT+CMGW Write SMS message to memory 

AT+CMGW Write SMS message to memory 


AT+CMGW=? 

Response 

OK





(+CMGF=1): 

AT+CMGW=[[,]] 

text is 

entered 

 

quits 

without sending 


(+CMGF=0): 

AT+CMGW= 

PDU is given 

 

Response 

TA transmits SMS message (either SMS-DELIVER or SMS-SUBMIT) 

from TE to memory storage . Memory location of the 

stored message is returned. By default message status will be set to 'stored 

unsent', but parameter allows also other status values to be given. 

If writing is successful: 

+CMGW: 

OK 


+CMS ERROR: 

Parameters 












GSM 04.11 TP-Originating-Address Type-of-Address octet 

in integer format (default refer ) 








integer type value indicating in the text mode (+CMGF=1) 

the length of the message body (or ) 

in characters; or in PDU mode (+CMGF=0), the length 

of the actual TP data unit in octets (i.e. the RP layer 

SMSC address octets are not counted in the length) 

In the case of SMS: GSM 04.11 SC address followed by 

GSM 03.40 TPDU in hexadecimal format: ME/TA 

converts each octet of TP data unit into two IRA 

character long hexadecimal number (e.g. octet with 

integer value 42 is presented to TE as two characters 

2A (IRA 50 and 65)). In the case of CBS: GSM 

03.41 TPDU in hexadecimal format.



Reference 

GSM 07.05 

Index of message in selected storage 

4.2.7 AT+CMSS Send SMS message from storage 

AT+CMSS Send SMS message from storage 


AT+CMSS=? 


AT+CMSS=[,[,]] 

Reference 

GSM 07.05 

Response 

OK 

Response 

TA sends message with location value from message storage 

to the network (SMS-SUBMIT). If new recipient address is 

given, it shall be used instead of the one stored with the message. Reference 

value is returned to the TE on successful message delivery. Values can 

be used to identify message upon unsolicited delivery status report result 

code. 


+CMGS: 

OK 


+CMGS: 

OK 


+CMS ERROR: 

Parameters 
















GSM 03.40 TP-Message-Reference in integer format



4.2.8 AT+CMGC Send SMS Command 

AT+CMGC Send SMS Command 


AT+CMGC=? 



(+CMGF=1): 

AT+CMGC=,[[,[,[, 

]]]] 

text is entered 

 

ESC quits without 

sending 


(+CMGF=0): 

AT+CMGC= 

PDU is given 

 

Response 

OK 

Parameters 

first octet of GSM 03.40 SMS-COMMAND (default 2) in 

integer format 

GSM 03.40 TP-Command-Type in integer format (default 0) 

GSM 03.40 TP-Protocol-Identifier in integer format (default 


0) 

GSM 03.40 TP-Message-Number in integer format 













integer type value indicating in PDU mode (+CMGF=0), the 

length of the actual TP data unit in octets (i.e. the RP 

layer SMSC address octets are not counted in the 

length)



Reference 

GSM 07.05 

Response 

TA transmits SMS Command message from a TE to the network 

(SMS-COMMAND). Message reference value is returned to the TE 

on successful message delivery. Value can be used to identify message upon 

unsolicited delivery status report result code. 


+CMGC: 

OK 


+CMGC: 

OK 


+CMS ERROR: 

Parameters 

GSM 03.40 TP-Message-Reference in integer format 

4.2.9 AT+CNMI New SMS message indications 

AT+CNMI New SMS message indications 


AT+CNMI=? 


AT+CNMI? 


AT+CNMI=[[,[, 

[,[,]]]]] 

Response 

+CNMI: (list of supported s),(list of supported s),(list of 

supported s),(list of supported s),(list of supported s) 

OK 

Parameters 


Response 

+CNMI: ,,,, 

OK 

Parameters 


Response 

TA selects the procedure for how the receiving of new messages from the 

network is indicated to the TE when TE is active, e.g. DTR signal is ON. If 

TE is inactive (e.g. DTR signal is OFF), message receiving should be done 

as specified in GSM 03.38. 

OK 


+CMS ERROR: 




Parameters 

0 Buffer unsolicited result codes in the TA. If TA result 


code buffer is full, indications can be buffered in some 

other place or the oldest indications may be discarded 

and replaced with the new received indications. 

1 Discard indication and reject new received message 

unsolicited result codes when TA-TE link is reserved 

(e.g. in on-line data mode). Otherwise forward them 

directly to the TE. 

2 Buffer unsolicited result codes in the TA when TA-TE 

link is reserved (e.g. in on-line data mode) and flush 

them to the TE after reservation. Otherwise forward 

them directly to the TE. 

3 Forward unsolicited result codes directly to the TE. 

TA-TE link specific inband technique used to embed 

result codes and data when TA is in on-line data mode. 

(the rules for storing received SMs depend on its data coding 

scheme (refer GSM 03.38 [2]), preferred memory 

storage (+CPMS) setting and this value): 

0 No SMS-DELIVER indications are routed to the TE. 

1 If SMS-DELIVER is stored into ME/TA, indication of 

the memory location is routed to the TE using 

unsolicited result code: +CMTI: , 

2 SMS-DELIVERs (except class 2) are routed directly to 

the TE using unsolicited result code: +CMT: 

[], (PDU mode 

enabled) or +CMT: , [], 

[,,,,,,,] (text mode enabled; about 

parameters in italics, refer command Show Text Mode 

Parameters +CSDH). Class 2 messages result in 

indication as defined in =1. 

3 Class 3 SMS-DELIVERs are routed directly to TE 

using unsolicited result codes defined in =2. 

Messages of other classes result in indication as 

defined in =1. 

(the rules for storing received CBMs depend on its data 

coding scheme (refer GSM 03.38 [2]), the setting of 

Select CBM Types (+CSCB) and this value): 

0 No CBM indications are routed to the TE. 

2 New CBMs are routed directly to the TE using 

unsolicited result code: +CBM: 

(PDU mode enabled) or



Reference 

GSM 07.05 

0 

+CBM: 

,,,, 

(text mode enabled). 

No SMS-STATUS-REPORTs are routed to the TE. 


1 SMS-STATUS-REPORTs are routed to the TE using 

unsolicited result code: +CDS: 

(PDU mode enabled) or 

+CDS: ,,[],[],,, 

(text mode enabled) 

0 TA buffer of unsolicited result codes defined within 


this command is flushed to the TE when 1...3 

is entered (OK response shall be given before flushing 

the codes). 

1 TA buffer of unsolicited result codes defined within 

this command is cleared when 1...3 is entered. 

+CMTI: , Indication that new message has been 

received 

+CMT: , Short message is output directly 

+CBM: Cell broadcast message is output 

4.2.10 AT+CPMS Preferred SMS Message Storage 

AT+CPMS Preferred SMS Message Storage 


AT+CPMS? 


AT+CPMS=? 

Response 

directly 

+CPMS:,,,,,,, 

, OK 


+CMS ERROR 

Parameters 


Response 

+CPMS: (list of supported s),(list of supported s) ,(list of 

supported s) 

Parameters 

see write command




AT+CPMS= 

 

[, 

[,]] 

Reference 

GSM 07.05 

Response 

TA selects memory storages , and to be used for 

reading, writing, etc. 

+CPMS:,,,,, 

OK 


+CMS ERROR: 

Parameters 

4.2.11 AT+CRES Restore SMS settings 

AT+CRES Restore SMS settings 


AT+CRES=? 


AT+CRES=[] 

Reference 

GSM 07.05 

Messages to be read and deleted from this memory 

storage 

"SM" SIM message storage 

Messages will be written and sent to this memory 

storage 


Received messages will be placed in this memory 


storage if routing to PC is not set ("+CNMI") 


Number of messages currently in 

Number of messages storable in 

Response 

+CRES: list of supported s 

OK 

Response 

TA restores SMS settings for +CMGF, +CNMI, +CSDH from non-volatile 

memory to active memory. 

OK 


+CMS ERROR: 

Parameters 

0 manufacturer specific profile number where setting are to 

be stored



4.2.12 AT+CSAS Save SMS settings 

AT+CSAS Save SMS settings 


AT+CSAS=? 


AT+CSAS=[] 

Reference 

GSM 07.05 

Response 

+CSAS: list of supported s 

OK 

Response 

TA saves current message service settings for +CMGF, +CNMI, +CSDH, 

to a non-volatile memory. 

OK 


+CMS ERROR: 

Parameters 

0 manufacturer specific profile number where settings are to be 

stored 

4.2.13 AT+CSCA SMS Service Center Address 

AT+CSCA SMS Service Center Address 


AT+CSCA? 


AT+CSCA=? 


AT+CSCA = 

[,] 

Response 

+CSCA: , 

OK 

Parameters 


Response 

OK 

Response 

TA updates the SMSC address, through which mobile originated SMS are 

transmitted. In text mode, setting is used by send and writes commands. In 

PDU mode, setting is used by the same commands, but only when the 

length of the SMSC address coded into parameter equals zero. 

Note: The command writes the parameters in NON-VOLATILE memory. 

OK 

Parameters 

GSM 04.11 RP SC address Address-Value field in string 


format; BCD numbers (or GSM default alphabet 




Service center address format GSM 04.11 RP SC address 

Type-of-Address octet in integer format (default refer 

)



Reference 

GSM 07.05 

4.2.14 AT+CSCB Select cell broadcast SMS messages 

AT+CSCB Select cell broadcast SMS messages 


AT+CSCB? 


AT+CSCB=? 


AT+CSCB= 

[[,mids>[, 

]]] 

Reference 

GSM 07.05 

Response 

+CSCB: ,, OK 

Parameters 


Response 

+CSCB: list of supported s OK 

Parameters 


Response 

TA selects which types of CBMs are to be received by the ME. 


OK 

Parameters 

0 message types specified in and are 

accepted 


1 message types specified in and are not 

accepted 

string type; all different possible combinations of CBM message 

identifiers (refer ) (default is empty string); e.g. 

"0,1,5,320-478,922". 

string type; all different possible combinations of CBM data 

coding schemes (refer ) (default is empty string); 

e.g. "0-3,5". 

4.2.15 AT+CSDH Show SMS text mode parameters 

AT+CSDH Show SMS text mode parameters 


AT+CSDH? 


AT+CSDH=? 

Response 

+CSDH: 

OK 

Parameters 


Response 

+CSDH: list of supported s 

OK




AT+CSDH= 

Reference 

GSM 07.05 

Parameters 


Response 

TA determines whether detailed header information is shown in text mode 

result codes. 

OK 

Parameters 

0 do not show header values defined in commands +CSCA 

4.2.16 AT+CSMP Set SMS text mode parameters 

AT+CSMP Set SMS text mode parameters 


AT+CSMP? 


AT+CSMP=? 


AT+CSMP=[[[,pid>[,]]]] 

Response 


and +CSMP (, , , , and 

) nor , or in +CMT, 

+CMGL, +CMGR result codes in text mode 

1 show the values in result codes 

+CSMP:,,, 

OK 

Parameters 


Response 

+CSMP:(list of supported s),(list of supported s) 

OK 

Parameters 


Response 

TA selects values for additional parameters needed when SM is sent to the 

network or placed in a storage when text mode is selected (+CMGF=1). It is 

possible to set the validity period starting from when the SM is received by 

the SMSC ( is in range 0... 255) or define the absolute time of the 

validity period termination ( is a string). 


OK



Reference 

GSM 07.05 

Parameters 

depending on the command or result code: first octet of 


GSM 03.40 SMS-DELIVER, SMS-SUBMIT (default 

17), SMS-STATUS-REPORT, or SMS-COMMAND 

(default 2) in integer format 

depending on SMS-SUBMIT setting: GSM 03.40 

TP-Validity-Period either in integer format (default 167) 

or in time-string format (refer ) 

GSM 03.40 TP-Protocol-Identifier in integer format. 

GSM 03.38 SMS Data Coding Scheme in Integer format. 

4.2.17 AT+CSMS Select Message Service 

AT+CSMS Select Message Service 


AT+CSMS? 


AT+CSMS=? 


AT+CSMS= 

 

Response 

+CSMS: ,,, 

OK 

Parameters 


Response 

+CSMS: list of supported s 

OK 

Parameters 


Response 

+CSMS: ,, OK 


+CMS ERROR:



Reference 

GSM 07.05 

Parameters 

0 GSM 03.40 and 03.41 (the syntax of SMS AT 

+SMALPHAID OK 

= 

Parameter 


commands is compatible with GSM 07.05 Phase 2 

version 4.7.0; Phase 2+ features which do not require 

new command syntax may be supported (e.g. correct 

routing of messages with new Phase 2+ data coding 

schemes)) 

128 SMS PDU mode - TPDU only used for 

sending/receiving SMSs. 

Mobile Terminated Messages: 

0 Type not supported 

1 Type supported 

Mobile Originated Messages: 



Broadcast Type Messages: 



4.3 Configuration commands for SMS 

AT+SMALPHAID CONFIGURE ALPHAID LOOKUP WHEN DISPLAYING SMS's 

AT+SMEXTRAINFO CONFIGURE EXTRA SMS INFORMATION DISPLAY 

AT+SMEXTRAUNSOL CONFIGURE EXTRA UNSOLICITED SMS MESSAGE 

4.3.1 AT+SMALPHAID CONFIGURE ALPHAID LOOKUP WHEN DISPLAYING SMS’s 

AT+SMALPHAID CONFIGURE ALPHAID LOOKUP WHEN DISPLAYING SMS’s 


+SMALPHAID=? 


+SMALPHAID? 


Response 

+ SMALPHAID: (list of supported s) 

OK 

Parameter 


Response 

+SMALPHAID : 

OK 

Parameter 


Response



Reference 

Enable/disable the Alphaid lookup for phonenumbers when 

displaying sms 

0 disable the Alphaid(default) 

1 enable the Alphaid 

Note 

4.3.2 AT+SMEXTRAINFO CONFIGURE EXTRA SMS INFORMATION DISPLAY 

AT+SMEXTRAINFO CONFIGURE EXTRA SMS INFORMATION DISPLAY 


+SMEXTRAINFO=? 


+ SMEXTRAINFO? 


+SMALPHAID 

= 

Reference 

Response 

+SMEXTRAINFO: (list of supported s) 

OK 

Parameter 


Response 

+ SMEXTRAINFO : 

OK 

Parameter 


Response 

OK 

Parameter 

Enable/disable the extra non-standard information on 

Note 


some commands and messages 

0 disable the extra non-standard information 

1 enable the extra non-standard information 

e.g. Adds an extra field onto the AT+CSCA command: 

+CSCA: "+447802000332",145,"BT Cellnet SMS" 

4.3.3 AT+SMEXTRAUNSOL CONFIGURE EXTRA UNSOLICITED SMS MESSAGE 

AT+SMEXTRAUNSOL CONFIGURE EXTRA UNSOLICITED SMS MESSAGE 


+SMEXTRAUNSOL=? 


+ SMEXTRAUNSOL? 

Response 

+ SMEXTRAUNSOL: (list of supported s) 

OK 

Parameter 


Response 

+ SMEXTRAUNSOL :




+SMEXTRAUNSOL 

= 

Reference 

OK 

Parameter 


Response 

OK 

Parameter 


Enable/disable the extra unsolicited messages. 

0 disable the extra unsolicited message 

1 enable the extra unsolicited message 

Note 

5 AT Commands for GPRS Support 

5.1 Overview of AT Commands for GPRS Support 


AT+CGATT ATTACH/DETACH FROM GPRS SERVICE 

AT+CGDCONT DEFINE PDP CONTEXT 

AT+CGQMIN QUALITY OF SERVICE PROFILE (MINIMUM ACCEPTABLE) 

AT+CGQREQ QUALITY OF SERVICE PROFILE (REQUESTED) 

AT+CGACT CONTEXT ACTIVATION 

AT+CGDATA ENTER DATA STATE 

AT+CGPADDR SHOW PDP ADDRESS 

AT+CGCLASS GPRS MOBILE STATION CLASS 

AT+CGEREP CONTROL UNSOLICITED GPRS EVENT REPORTING 

AT+CGREG NETWORK REGISTRATION STATUS 

AT+CGSMS SELECT SERVICE FOR MO SMS MESSAGES 

AT+CGCOUNT GPRS PACKET COUNTERS 

5.2 Detailed Descriptions of AT Commands for GPRS Support 

5.2.1 AT+CGATT Attach or detach from GPRS service 

AT+CGATT Attach or detach from GPRS service 


+CGATT=? 


+CGATT? 

Response 

+CGATT: (list of supported s) 

Parameter 


Response 

+CGATT: 

Parameter




+CGATT=[] 

Reference 

GSM07.07 


Response 

OK 

ERROR 

Parameter 

indicates the state of GPRS attachment 

0 – detached 

1 – attached 

Other values are reserved and will result in an ERROR 

response to the execution command. 

Note 

5.2.2 AT+CGDCONT Define PDP context 

AT+CGDCONT Define PDP context 


+CGDCONT=? 


+CGDCONT? 


+CGDCONT=[[,, 

[APN>[,[,[, 

]]]]]] 

Response 

+CGDCONT: (range of supported s), , , 

, (list of supported s),



Reference 

GSM07.07 

(Access Point Name) a string parameter which is a logical 


name that is used to select the GGSN or the external packet 

data network. If the value is null or omitted, then the 

subscription value will be requested. 

a string parameter that identifies the MT in the address 

space applicable to the PDP. If the value is null or omitted, 

then a value may be provided by the TE during the PDP 

startup procedure or, failing that, a dynamic address will be 

requested. The read form of the command will continue to 

return the null string even if an address has been allocated 

during the PDP startup procedure. The allocated address 

may be read using the +CGPADDR command. 

a numeric parameter that controls PDP data compression 

0 – off (default if value is omitted) 

1 – on 

Other values are reserved 

a numeric parameter that controls PDP data compression 

Note 

0 – off (default if value is omitted) 

1 – on 

Other values are reserved 

Note: At present only one data compression algorithm 

(V.42bis) is provided in SNDCP. If and when other 

algorithms become available, a command will be provided 

to select one or more of these. 

5.2.3 AT+CGQMIN Quality of service profile (minimum acceptable) 

AT+CGQMIN Quality of service profile (minimum acceptable) 


+CGQMIN=? 


+CGQMIN? 

Response 

+CGQMIN: ,(list of supported s),(list of 

supported s),(list of supported s),,, 

[+CGQMIN:,,,,,




+CGQMIN=[] 

Reference 

GSM07.07 

 

[…]] 

Parameter 


Response 

OK 

ERROR 

Parameter 

a numeric parameter which specifies a particular PDP context 

definition (see +CGDCONT command) 

The following parameter are defined in GSM 03.60 

a numeric parameter which specifies the precedence class 

a numeric parameter which specifies the delay class 

a numeric parameter which specifies the reliability class 

a numeric parameter which specifies the peak throughput 

class 

a numeric parameter which specifies the mean throughput 

class 

Note 

5.2.4 AT+CGQREQ Quality of service profile (requested) 

AT+CGQREQ Quality of service profile (requested) 


+CGQREQ=? 


+CGQREQ? 


+CGQREQ=[[,[, 

[,



ity>[,[,]]]]]] 

Reference 

GSM07.07 

a numeric parameter which specifies a particular PDP context 

definition (see +CGDCONT command) 

The following parameter are defined in GSM 03.60 

a numeric parameter which specifies the precedence class 

a numeric parameter which specifies the delay class 

a numeric parameter which specifies the reliability class 

a numeric parameter which specifies the peak throughput 

class 

a numeric parameter which specifies the mean throughput 

class 

Note 

5.2.5 AT+CGACT PDP context activate or deactivate 

AT+CGACT PDP context activate or deactivate 


+CGACT=? 


+CGACT? 


+CGACT=[[,[,[, 

…]]]] 

Reference 

GSM07.07 

Response 

+CGACT: (list of supported s) 

Parameter 


Response 

+CGATT:, 

[+CGACT:, 

[…]] 

Parameter 


Response 

OK 

NO CARRIER 

ERROR 

Parameter 

indicates the state of PDP context activation 

0 – deactivated 

1 – activated 


Other values are reserved and will result in an ERROR 


a numeric parameter which specifies a particular PDP 

Note 

context definition (see +CGDCONT command) 

If context is deactivated successfully, NO CARRIER is returned 

5.2.6 AT+CGDATA PDP context activate or deactivate 

AT+CGDATA PDP context activate or deactivate




+CGDATA=? 


+CGDATA=[[,[,[ 

,…]]]] 

Reference 

GSM07.07 

Response 

+CGDATA: (list of supported s) 

Parameter 


Response 

OK 

ERROR 

Parameter 

a string parameter that indicates the layer 2 protocol to be 

used between the TE and MT: 

PPP – Point to Point protocol for a PDP such as IP 

Other values are not supported and will result in an ERROR 




Note 

The command does not fully implement the CGDATA command as 

specified in GSM 07.07. The command will not enter data state once the 

PDP context has been activated and will simply generate the result code 

“OK” if the context has been successfully activated. 

5.2.7 AT+CGPADDR Show PDP address 

AT+CGPADDR Show PDP address 


+CGPADDR=? 


+CGPADDR=[[,[,…]]] 

Response 

+CGPADDR: (list of defined s) 

Parameter 


Response 

+CGPADDR: , 

[+CGPADDR:,[…]] 

ERROR 

Parameter 



context definition (see +CGDCONT command) If no 

is specified, the addresses for all defined contexts are 

returned. 

a string that identifies the MT in the address space 

applicable to the PDP. The address may be static or 

dynamic. For a static address, it will be the one set by the 

+CGDCONT command when the context was defined. For 

a dynamic address it will be the one assigned during the last 

PDP context activation that used the context definition 

referred to by . is omitted if none is 

available.



Reference 

GSM07.07 

Note 

This command dictates the behavior of PPP in the ME but not that of any 

other GPRS-enabled foreground layer, e.g. browser. 

5.2.8 AT+CGCLASS GPRS mobile station class 

AT+CGCLASS GPRS mobile station class 


+CGCLASS=? 


+CGCLASS? 


+CGCLASS= 

[ [, 

[, […]]]] 

Reference 

GSM07.07 

Response 

+CGCLASS: (list of supported s) 

Parameter 


Response 

+CGCLASS: 

Parameter 


Response 

OK 

ERROR 

Parameter 

a string parameter which indicates the GPRS mobile class 

(in descending order of functionality) 

A class A (highest) 

B class B 

C class C 

CG class C in GPRS only mode 

CC class C in circuit switched only mode (lowest) 

Note 

Class A is not supported by the SIMCOM GPRS solution. 

Class C is only supported for values of “CG” and “C 

5.2.9 AT+CGEREP Control unsolicited GPRS event reporting 

AT+CGEREP Control unsolicited GPRS event reporting 


+CGEREP=? 


+CGEREP? 


Response 

+CGEREP: (list of supported s) 

Parameter 


Response 

+CGEREP: 

Parameter 


Response 

+CGEREP= 

ERROR 




Reference 

GSM07.07 

Parameter 

0 buffer unsolicited result codes in the MT; if MT result 


code buffer is full, the oldest ones can be discarded. No 

codes are forwarded to the TE. 

1 discard unsolicited result codes when MT-TE link is 

reserved (e.g. in on-line data mode); otherwise forward 

them directly to the TE 

Unsolicited Result Codes supported: 

+CGEV: NW DEACT , [,] 

+CGEV: ME DEACT , [,] 

+CGEV: NW DETACH 

+CGEV: ME CLASS 

parameter 

Packet Data Protocol type (see +CGDCONT command) 

Packet Data Protocol address (see +CGDCONT command) 

Context Id (see +CGDCONT command) 

GPRS mobile class (see +CGCLASS command) 

Note 

5.2.10 AT+CGREG Network registration status 

AT+CGREG Network registration status 


+CGREG=? 


+CGREG? 


+CGREG=[] 

Response 

+CGREG: (list of supported s) 

Parameter 


Response 

+CGREG:,[,,] 

+CME ERROR: 

Parameter 


Response 

OK 

ERROR 

Parameter 

0 disable network registration unsolicited result code 

1 enable network registration unsolicited result code 

+CGREG: 

2 enable network registration and location information 

unsolicited result code +CGREG: [,,] 

 

0 not registered, ME is not currently searching a new 

operator to register to



Reference 

GSM07.07 

1 registered 

string type; two byte location area code in hexadecimal format 

(e.g. “00C3” equals 195 in decimal) 

string type; two bytes cell ID in hexadecimal format 

Note 

For parameter stat, options 0 and 1 supported only. 

5.2.11 AT+CGSMS Select service for MO SMS messages 

AT+CGSMS Select service for MO SMS messages 


+CGSMS=? 


+CGSMS? 


+CGSMS=[] 

Reference 

GSM07.07 

Response 

+CGSMS: (list of currently available s) 

Parameter 


Response 

+CGSMS: 

Parameter 


Response 

OK 

ERROR 

Parameter 

a numeric parameter which indicates the service or service 

Note 

preference to be used 

0 GPRS 

1 circuit switched 


2 GPRS preferred (use circuit switched if GPRS not 

available) 

3 circuit switched preferred (use GPRS if circuit 

switched not available) 

The circuit switched service route is the default method 

5.2.12 AT+CGCOUNT GPRS packet counters 

AT+CGCOUNT GPRS packet counters 


+CGCOUNT=? 


+CGCOUNT? 

Response 

+CGCOUNT: (list of supported s),(list of supported s),(list 

of supported s) 

Parameter 


Response 

+CGCOUNT:,[,] 

[+CGCOUNT:,[,]




+CGCOUNT=,[,] 

Reference 

GSM07.07 

[…]] 

Parameter 

indicates the state of the GPRS counters 

1 – periodic. The will then also be displayed 

2 – on GPRS context deactivation. is N/A in this case 

For other parameters see set command 

Response 

OK 

ERROR 

Parameter 

indicates the action to be performed 

0 – reset counter for specified 

1 – read counter for specified 

2 – start reporting counter periodically for specified 

defined by . Counter is also reported on context deactivation. 

3 – report counter on context deactivation for specified 

 

4 – stop reporting counter on specified 



period for periodic packet counter reporting in seconds 

Unsolicited Result 

Once a counter has been setup for a the counter will be displayed as 

Following either periodically or when the context has been deactivated: 

a numeric 32 parameter which indicates the number of compressed 


bytes transferred in the uplink direction displayed in 

decimal format 

a numeric 32 bit parameter which indicates the number of 

uncompressed bytes transferred in the uplink direction 

displayed in decimal format 

a numeric 32 bit parameter which indicate the number of N-PDUs 

(i.e. IP packets) transferred in the uplink direction 


a numeric 32 bit parameter which indicates the number of 

compressed bytes transferred in the downlink direction 


a numeric 32 bit parameter which indicates the number of N-PDUs 

(i.e. IP packets) transferred in the downlink direction 


Note that the current counter values will be displayed immediately this 

Note 

command is entered for any action (i.e. even stopping 

the counter display will generate the above unsolicited 

result code for the cancelled ) 

This command displays byte and IP packet counters for GPRS contexts. It is



proprietary to SIMCOM. 

If counters are displayed periodically, they will only be displayed if: 

- there is a separate multiplexer channel for unsolicited result codes, or 

- the user switches to command mode using the “+++” escape sequence 

6 AT Commands for SIM Application Toolkit 

This section defines the AT Commands implemented in SIM300D for the control of the SIM 

Application Toolkit protocol, as per specification GSM 11.14. The table in section 6.1 lists the 

AT commands supported – these are SIMCOM proprietary commands as no formal specification 

currently exist defining STK functionality via an AT interface. The parameters supported by each 

AT command for the different proactive commands are given in the subsections which follow the 

main table. 

The protocol defined below provides a generic mechanism for the exchange of information 

between the ME and the application for a typical proactive SIM command. 

How to use SIM300D STK AT interface please see document 

SIM300D_STK_USER_GUIDE.DOC 




6.1 Overview of Commands, Responses and Result codes 

The following tables outline the AT commands, responses and unsolicited result codes applicable 

for control of the SIM Application Toolkit protocol via the AT command interface. 

Notation Description 

+STC: Unsolicited result code issued by the CI Task to the application to indicate 

either: 

• there is no STK application available on the SIM 

• there is a proactive SIM command to retrieve and action 

end of the current proactive command session – used if the user wishes to 

terminate the current proactive SIM session. 

+STGC=… AT command to Get Command parameters for a proactive SIM command from 

the CI Task. This will be sent from the application after unsolicited result code 

+STC: informs it the SIM has issued a proactive SIM command to be 

performed. 

+STCR=… AT command to provide Command Response parameters for a previously 

executed proactive SIM command. Its purpose is to relay response data to the 

lower layers of the SIMCOM protocol stack to allow the Terminal Response 

SIM command (see [10]) to be returned to the SIM for the current proactive 


+STPD=… AT command to provide Profile Download parameters to the CI Task. This 

contains information relating to the SIM Application Toolkit capabilities of the 

application, and is used by the SIMAT task to limit its SAT instruction set 

accordingly. 

Any application plugging into the serial port should send this command or it 

will be assumed that the application has no SAT support and will therefore 

never receive any SAT related information. 

+STMS=… AT Command for selecting a menu option. On power-up the SIM will send the 

Set-Up-Menu proactive indication. The accessory should load and display the 

menu structure. This AT command should be used to inform SIM300D of the 

item selected from the list. 

+STEV=… This command is used to inform the MS that an MMI specific event has 

occurred. 

+STRT=… AT command for setting the automatic response timer used by the CI Task to 

issue the Terminal Response (no user response) to a proactive command which 

has not been processed. The default response time is ten seconds, but it is 

recommended this is increased when performing SIM Toolkit FTA. 

+STTONE=… AT command for playing SIM Toolkit Tones in both idle and dedicated mode. 

This command should be used in conjunction with the Play Tone proactive 





6.2 Definition of Unsolicited Result Codes 

Not all proactive commands are required to be visible to the application. For example, the 

proactive commands More Time and Provide Local Information are transparent and therefore do 

not require an unsolicited result code to be sent to the user. The commands, which are relevant for 

user interaction in one form or another, are listed in the following tables. 

The output generated for strings is controlled by the +CMGF AT command. The factory default 

for string output is PDU mode where strings are output in HEX. The tables below illustrate the 

alternative mechanism of TEXT output; this is obtained by using the +CMGF AT command with a 

parameter of one. 

6.2.1 +STC Command 

+STC Informs the application of the type of proactive SIM command data awaiting 

retrieval. 

Result Code: 

+STC: 

Reference Note 

Parameters 

Hexadecimal format of Type of Command . Unique identifier for 


the current SIM Toolkit proactive command issued by the SIM - 

The following values are supported: 

‘10’ Get Acknowledgement For Set Up Call command 

‘15’ Launch Browser command 

‘20’ Play Tone command 

‘21’ Display Text command 

‘22’ Get Inkey command 

‘23’ Get Input command 

‘24’ Select Item command 

‘25’ Set Up Menu command 

‘28’ Set Up Idle Mode Text command 

‘40’ Open Channel command 

‘14’ Send DTMF command 

‘05’ Set Up Event List command 

‘81’ End of proactive session 

The special case is +STC: 0 that is issued when there is no STK application 

accessible on the SIM. 

The following tables in this section detail the information that is distributed to the application for 

proactive indications using unsolicited result codes. The information applicable to the proactive 

command is sent to the application using the +STUD (SIM Toolkit Unsolicited Data) results code.



6.2.2 Send SM 

Command data for Send Short Message unsolicited proactive command 

Result Code 

+STUD: 

13[,[,< 

iconId>,]] 


Parameters 

13 hex notation: Command Type value. 

See Section 6.2 for values. 

string format: using either SMS default 

alphabet or UCS2 alpha field coding 

‘0’ : Special case indicating SIM provided a 


null alphaId and user should not be informed of SMS transaction. 

If alphaId field is not present it is up to the 

ME to decide whether to inform the user or not. 

Numeric tag for the icon to be displayed – 

corresponds to the index in the Image file on 

the SIM 

0 No icon 

1..255 Icon tag 

integer: denotes use of associated icon 

0 display icon only (replaces any text string or alphaId) 

display with alphaId or text string 

6.2.3 Send SS 

Command data for Send SS unsolicited proactive command 

Result Code 

+STUD: 

11[,[,< 

iconId>,]] 


Parameters 



string format: using either SMS default alphabet or UCS2 

alpha field coding to inform user of current transaction. 

‘0’ : Special case indicating SIM provided a null alphaId and user 

should not be informed of SS transaction. 

If alphaId field is not present it is up to the ME to decide whether 

to inform the user or not. 

Numeric tag for the icon to be displayed – corresponds to the 

index in the Image file on the SIM 

0 No icon 




1 display with alphaId or text string



6.2.4 Send USSD 

Command data for Send USSD unsolicited proactive command 

Result Code 

+STUD: 

12[,[,< 

iconId>,]] 


Parameters 






‘0’ : Special case indicating SIM provided a null alphaId and 

user should not be informed of USSD transaction. 

If alphaId field is not present it is up to the ME to decide 

whether to inform the user or not. 

Numeric tag for the icon to be displayed – corresponds to 

the index in the Image file on the SIM 

0 No icon 




1 display with alphaId or text string 

6.2.5 Set Up Call 

Command data for Set Up Call unsolicited proactive command 

Result Code 

+STUD: 

10,,,[, 

,] 


Parameters 




alpha field coding 







0 No icon 







6.2.6 Close Channel 

Command data for Close Channel proactive command 

Result Code 

+STUD: 

41[,[,< 

iconId>,]] 


6.2.7 Receive Data 

Parameters 






‘0’ : Special case indicating SIM provided a null alphaId and the 

user should not be informed of the current transaction. 


or not to inform the user. 



0 No icon 





Command data for Receive Data proactive command 

Result Code 

+STUD: 

42,[,[,,]] 


Parameters 



integer type: number of bytes requested in command 


alpha field coding to inform user ofcurrent transaction. 







0 No icon 







6.2.8 Send Data 

Command data for Send Data proactive command 

Result Code 

+STUD: 

43,,[,[,< 

iconId>,]] 


Parameters 

6.2.9 Language Notification 



integer type: number of bytes of data transmitted 

string type: channel data – coded as 8bit data. 


This appears in BCD notation with two TE characters 

representing one byte of actual data. 



‘0’ : Special case indicating SIM provided a null alphaId and 

the user should not be informed of the current transaction. 





0 No icon 





Command data for Language Notification proactive command 

Result Code 

+STUD: 

35[,] 


6.2.10 Run AT 

Parameters 



language code: coded as pair of alphanumeric 

characters, as given in ISO 639 [12]. 

The language parameter is optional. Its inclusion in the result code indicates 

a specific language notification. Omission from the result code indicates a 

non-specific language notification, which cancels a previous specific 

language notification 

Command data for Run AT Command proactive command 

Result Code 

+STUD: 

34[,[,< 

Parameters 


See Section 6.2 for values.



iconId>,]] 


6.2.11 Refresh 









index in the Image file on the SIM. 

0 No icon 



Command data for Refresh proactive command 

Result Code 

+STUD: 

01,[,< 

numFiles>,] 


Parameters 





hex notation: command Qualifier information 

giving the type of Refresh to be performed. 

00 SIM Initialisation and Full File Change 

Notification 

01 File Change Notification 

02 SIM Initialisation and File Change Notification 

03 SIM Initialisation 

04 SIM Reset 

integer: gives number of Files in the list 

string type, hex notation: gives the full paths for 

the SIM files, each file being delimited by 

commas within the string 

For values ’01’ and ‘02’ file list data must be provided by the 

SIM. For all other values any included file list information will 

be ignored. If the optional parameter is not present in the result 

code, we assume that s ’01’and ‘02’ cannot occur.



6.3 ME Initialisation Procedure 

On powering up the ME the SIM’s Phase file (EF 0x6FAE) is read. If this indicates the SIM is of 

Phase 2+ or greater the ME sends a Terminal Profile command (see [3]) to the SIM to inform it of 

the SIM Application Toolkit capabilities of the ME. The SIM then limits its instruction set based 

on this profile. This terminal profile data is configurable and resides in an application layer 

configuration file for ease of customisation. On sending the Profile Download command The SIM 

will respond with signals that will provide the ME with information on whether the SIM has a 

SIM Toolkit application present. 

If on completing ME initialisation the stack determines that the SIM has no STK capability an 

unsolicited result code +STC: 0 will be issued to indicate to the user that there is no SIM toolkit 

availability during the current session. 

However, if STK information is available for use by the ME/application then the lower layers of 

the SIMCom Protocol Stack are informed and the first proactive command to be sent from the 

SIM to the user will be the Set Up Menu command to allow the available STK menu to be added 

to the ME’s own menu structure (i.e. unsolicited result code +STC: 25 will be issued by the CI 

Task after it has received this proactive command from the SIMAT task. 

6.4 Definition of AT Commands 

This section details the AT commands for driving an STK application on the SIM. 

6.4.1 AT+STGC SIM Toolkit Get Command parameters 

Get proactive Command parameters 


+STGC= Parameter 

Reference 

+STGC: , 

hex notation: Command Type value 


proactive command specific data, dependent on 

The information varies between proactive SIM commands, according to the type of 

command issued by the SIM, as given by . This reflects the useful part of the proactive 

command from a user’s perspective. The result codes returned to the application on a command by 

command basis are outlined in the following subsections: 

6.4.1.1 Display Text 

Command data for Display Text proactive command 

Result Code 

+STGC: 

21,,, 

Parameters 






,[,,[,]] 


integer: data coding scheme used for . 

The schemes used are as per GSM 03.38 for SMS 

0 7bit GSM default alphabet (packed) 

4 8bit data 

8 UCS2 alphabet 

string format: text string in format 

integer: display priority information 

0 Normal priority 

1 High priority 

integer: mode of clearing message 

0 Clear after delay 

1 User clears message 



0 No icon 




0 Display icon only (replaces any text string or alphaId) 

1 Display with alpha Id or text string 

0 normal response expected 

1 immediate response expected. 

6.4.1.2 Get Inkey 

Command data for Get Inkey proactive command 

Result Code 

+STGC: 

22,,, 

,[, 

,] 

Parameters 



integer: data coding scheme used for 

The schemes used are as per GSM 03.38 for 

SMS 


4 8bit data 



integer: expected response character format. 

0 Digits (0-9, *, # and +) only 

1 SMS default alphabet 


3 Yes/No response only 

0 no help information available 

1 help information available 

Numeric tag for the icon to be displayed –




corresponds to the index in the Image file on 

the SIM 

0 No icon 



0 display icon only 


(replaces any text string or alphaId) 

1 display with alpha Id or text string 

Entry of the Digits only response is the same regardless of alphabet set – 

coding of this response is performed within the SIMCOM Protocol Stack 

when creating the Terminal Response 

6.4.1.3 Get Input 

Command data for Get Input proactive command 

Result Code 

+STGC: 

23,,, 

,,,< 

minLgth>,[,,[,,]] 

Parameters 



integer: data coding scheme used for or . 

The schemes used are as per GSM 03.38 for SMS. 


4 8bit data 



integer: expected response characters and their format. 

1 Digits (0-9, *, # and +) only from SMS default 

alphabet (unpacked) 

2 Digits (0-9, *, # and +) only from SMS default 

alphabet (packed) 

3 Digits from UCS2 alphabet 

4 SMS default alphabet (unpacked) 

5 SMS default alphabet (packed) 


0 echo input to display 

1 no echo allowed (see Note) 



Integer: minimum length of expected response,in range 0..255 

0 indicates no minimum length requirement 

Integer: maximum length of expected response, in range 1..255 

255 indicates no maximum length requirement 

Numeric tag for the icon to be displayed –corresponds to the 

index in the Image file on the SIM (see [10]) 

0 No icon









Actual input string may not be displayed in this case but can alternatively be 

masked to indicate key entry using characters from the set (0-9, * and #). 

If and are equal, the response string is to be of fixed 

length. 

6.4.1.4 Play Tone 

Command data for Play Tone proactive command 

Result Code 

+STGC: 

20[,[,< 

tone>[,]]] 


Parameters 





integer: identifies requested tone type. 

SST denotes a Standard Supervisory Tone, 

MPT denotes an ME Proprietary Tone. 

1 Dial (SST) 

2 Called subscriber busy (SST) 

3 Congestion (SST) 

4 Radio Path acknowledge (SST) 

5 Radio path not available / Call dropped (SST) 

6 Error / Special information (SST) 

7 Call waiting (SST) 

8 Ringing Tone (SST) 

16 General Beep (MPT) 

17 Positive ack (MPT) 

18 Negative ack or Error (MPT) 

integer: duration of the tone to be played, given in 

milliseconds. 

If no tone is specified the ME shall default to the General Beep SST. 

If no duration is specified the ME default of 500ms is chosen. 

6.4.1.5 Set Up Menu 

Command data for Set Up Menu proactive command 

Result Code 

+STGC: 

25,, 

,,



Menu>[,,]< 

LF> 

+STGC: 

,[,,< 

dispMode>, 

[+STGC: 

,[,,< 

dispMode>, 

[…]]]] 


0 is a special case, indicating the existing menu is to be 

removed from the ME’s menu structure. 

integer: gives preferred user selection method 

0 no selection preferrence 

1 soft key selection preferred 



0 do not remove the current menu 

1 remove the current menu 






0 No icon 





integer: denotes the identifier of the item 



hex notation: next action indicator – this takes one of the 

allowed values from the Command Type (see section 5.2) 

range, as specified in [9], section 13.4 

6.4.1.6 Select Item 

Command data for Select Item proactive command 

Result Code 

+STGC: 

24,, 

,,[,,]< 

LF> 

+STGC: 

,[,,< 

dispMode>, 

[+STGC: 

,



ext>[,,< 

dispMode>, 

[…]]]] 



0 No icon 






integer: denotes the identifier of the item 



hex notation: next action indicator – this takes one of the allowed 

6.4.1.7 Get Acknowledgement For Set Up Call 

Command data for Set Up Call proactive command 

Result Code 

+STGC: 

10,[,,] 


Parameters 

values from the Command Type (see section 6.2) range 







0 No icon 





6.4.1.8 Set Up Idle Mode Text 

Command data for Set Up Idle Mode Text proactive command 

Result Code 

+STGC: 

28,,[, 

,] 

Parameters 






4 8bit data 



See Note below. 

Numeric tag for the icon to be displayed – corresponds to the





0 No icon 






If the text string given in the result code is Null (i.e. zero length and set as 

“” in the result code) it implies the existing Idle Mode Text is to be 

removed. 

6.4.1.9 Send DTMF 

Command data for Send DTMF proactive command 

Result Code 

+STGC: 

14[,[,< 

iconId>,]] 


Parameters 











0 No icon 





6.4.1.10 Launch Browser 

Command data for Launch Browser proactive command 

Result Code 

+STGC: 

15,,< 

url>[,[,[,,[,,[,[,,]]]]]] 

Parameters 



hex notation: command qualifier information from Command 

Object: 

Details Data 

00 launch browser without making 

connection, if not already launched 

01 launch browser making connection, 

if not already launched




02 use existing browser 


03 close existing browser, launch new browser, 

making a connection 

04 close existing browser, launch new browser, using 

secure session 

string format: 8bit data using GSM default 7bit alphabet. 

Special case: =”” – Null value, so use default URL 

hex notation: Browser Id to use. 

Available values: 

‘00’ Use default browser 

hex notation: list of allowed bearers in priority order. 

Possible values: 

‘00’ SMS 

‘01’ CSD 

‘02’ USSD 

‘03’ GPRS 

integer: denotes the number of provisioning files given 

string type, hex notation file ids: 

List of Provisioning File Reference ids. Full Paths are given, 

delimeted within the string by a comma 




4 8bit data 







0 No icon 





6.4.1.11 Open Channel 

Command data for Open Channel proactive command 

Result Code 

+STGC: 

40[,[,< 

iconId>,



de>]] alpha field coding to inform user of current transaction. 







6.4.1.12 Set Up Event List 


0 No icon 






Command data for Set Up Event List proactive command 

Result Code 

+STGC: 

05, 


Parameters 



hex: denotes applicable event identifiers. 

05 User activity event 

06 Idle Screen Available event 

08 Language Selection event 

09 Browser termination event 

FF Remove existing event list 

value of FF used to remove existing list of events as value 0 

can be confused with event MT Call value. 

This command causes the application to send a GSM 11.14 [9] 

ENVELOPE (EVENT DOWNLOAD) command to the SIM. 

6.4.2 AT+STCR SIM Toolkit Command Response 

Once a proactive command has been processed by the application a response needs to be sent to 

the SIM in the form of a TERMINAL RESPONSE command. It is therefore only a requirement 

for the application to issue command +STCR for those proactive commands it already retrieved 

via the +STGC AT command. The general format is shown below: 

AT+STCR SIM Toolkit Command Response data 


+STCR=



>,[,] 

Reference 

Parameter 

hex notation: dependent on the command type – see 


following sections for each proactive command 

supported.The values given in the result field for each set of 

proactive command response parameters the setting of the general 

result parameter returned to the SIMAT task in the next phase of 

signaling for building the Terminal Response command. 

additional data provided for certain commands, as required for the 

Terminal Response returned to the SIM after processing a 

proactive SIM command 

For the above AT Command, the data contained within the field varies depending on the 

current proactive SIM command being processed. The result data available for each of the 

proactive commands processed by the application is described in the following subsections: 

6.4.2.1 Display Text 

Command response for Display Text proactive command 


+STCR=21, 


Parameters 



integer: possible values: 

0 Message displayed OK 

1 Terminate proactive session 

2 User cleared message 

3 Screen is busy 

4 Backward move requested 

5 No response from user 

6.4.2.2 Get Inkey 

Command response for Get Inkey proactive command 


+STCR=22,[,,] 

Parameters 




0 Data entered OK 


2 Help information requested 

3 Backward move requested









4 8bit data 



Special cases are: 

“00” Negative response entered 

“01” Positive response entered 

The and information must be provided for =0 as the 

SIM expects the input to be provided in a Text String Data Object in the 

Terminal Response SIM command when data has been input. 

6.4.2.3 Get Input 

Command response for Get Input proactive command 


+STCR=23,[,,] 


Parameters 




0 Data entered OK 






The schemes used are as per GSM 03.38 for SMS . 


4 8bit data 


If the is present but is an empty string this indicates a null 

text string data object must be sent to the SIM. This is caused by the 

user making an ‘empty’ input. 

6.4.2.4 Play Tone 

Command response for Play Tone proactive command 


+STCR=20, 

Parameters 

20 Hex notation: Command Type value. 

See section 6.2 for values. 


0 Command performed OK 

1 Terminate proactive session




2 Tone not played 


3 Specified tone not supported 

6.4.2.5 Set Up Menu 

Command response for Set Up Menu proactive command 


+STCR=25, 


Parameters 




0 Menu successfully added/removed 

1 User chosen menu item 


3 Problem with menu operation 

6.4.2.6 Select Item 

Command response for Select Item proactive command 


+STCR=24,[,] 


Parameters 




0 Item Selected OK 




4 No response given 

integer: denotes identifier of item selected 

6.4.2.7 Get Acknowledgement For Set Up Call 

Command response for Set Up Call proactive command 


+STCR=10, 

Parameters 




0 user accepted call (conf phase only) 

1 user rejected call (conf phase only) 

2 user cleared call (any phase)




6.4.2.8 Set Up Idle Mode Text 

Command response for Set Up Idle Mode Text proactive command 


+STCR=28, 


Parameters 




0 Text successfully added/removed 


1 Problem performing command 

6.4.2.9 Send DTMF 

Command response for Send DTMF proactive command 


+STCR=13, 


Parameters 




0 DTMF not accepted 

1 DTMF required. 

6.4.2.10 Launch Browser 

Command response for Launch Browser proactive command 


+STCR=15, 


Parameters 




0 Command performed successfully 

1 Command performed – partial comp 

2 Command performed – missing info 

3 User rejected launch 

4 Error – no specific cause given 

5 Bearer unavailable 

6 Browser unavailable 

7 ME cannot process command 

8 Network cannot process command 

9 Command beyond MEs capabilities.



6.4.2.11 Open Channel 

Command response for Open Channel proactive command 


+STCR=40, 


Parameters 




0 Channel not accepted 

1 Channel required. 

6.4.2.12 Set Up Event List 

Command response for Set Up Event List proactive command 


+STCR=05, 


Parameters 




0 Command performed successfully 

1 Cannot perform command. 

6.4.3 AT+STPD SIM Toolkit Profile Download 

When an application is plugged into the serial port the command interpreter needs to have 

knowledge of its SAT capabilities to enable it to route all SAT related signaling to that application 

if required. If this command is not received it will be assumed that any attached application has no 

SAT capability and will therefore not send any related signals to it. If the SIM has reported that it 

does not have any proactive capability then an STC: 0 unsolicited response will be sent to the 

application. 

AT+STPD SIM Toolkit Command Response data 


+STPD=, 

Response 

OK 

+CME ERROR: 

+STC: 0 

Parameter 


Integer 


Determines the number of bytes of used for the Profile 

Download data from the application. 

List Of Hex Values, two digits each: 

Hexadecimal representation of the Terminal Profile data 

Some octets are optional in the profile, hence the inclusion of a length



parameter. For example, the following command sets all the bits in octets 3 

and 4: AT+STPD=4,0000FFFF. 

6.4.4 AT+STEV SIM Toolkit Event Command 

The application can inform the MS of defined MMI events using this command. 

AT+STEV SIM Toolkit Event Command 


AT+STEV=? 


+STEV=, 

Response 

+STEV: (supported list) 

+CME ERROR: 

Response 

Parameter 


+CME ERROR: 

hex two digits: 

05 User Activity Event 

06 Idle Screen Event 

08 Language Selection Event 

09 Browser Termination Event 

FF Clear Current Event List 

string type up to two characters 

The parameter is applicable only to Language Selection 

Event. For example the language can be set by: AT+STEV=09,”11” 

6.4.5 AT+STMS SIM Toolkit Main Menu Selection Command 

The application may set up its main menu on receipt of the Set Up Menu SIM Toolkit event. The 

application can select an item from the menu by sending this AT command to the MS. 

AT+STMS SIM Toolkit Menu Selection Command 


AT+STMS=? 


+STMS=[ 

Response 

+STMS: (range of available s), 

+CME ERROR: 

Response 

,help] Parameter 


+CME ERROR: 

numeric type, giving unique identifier of menu item 

numeric type 

For example, AT+STMS=2,1 will select item 2 from the main menu with 

help. 

6.4.6 AT+STRT SIM Toolkit Response Timer Command 

When a proactive command is received from the SIM an automatic response timer is started. If 

this timer expires before the application has provided a suitable response via the +STCR command, 




a Terminal Response is sent to the SIM containing a result of No User Response. This AT 

command allows the automatic response timeout period to be configured by the application at 

run-time, thus giving it extended time to respond to certain proactive commands (e.g. the Get 

Input command may request a long input string to be entered as part of the associated test case). 

The default setting for the response timer is ten seconds, and the maximum duration available is 

one hour. 

AT+STRT SIM Toolkit Response Timer Command 


AT+STRT? 


AT+STRT=? 


+STRT= 

Response: 

+STRT: 

+CME ERROR: 

Parameter 

See Write command 

Response 

+STRT: (list of supported s) 

+CME ERROR: 

Response 


+CME ERROR: 

Parameter 

numeric type. Minimum = 1s, maximum = 3600s 

Default setting is ten seconds 

6.4.7 AT+STTONE SIM Toolkit Tone Command 

The application may request a tone to played after receiving the Play Tone proactive command. 

The application either starts playing the tone with the requested tone Id, or stops playing the 

current tone depending on the parameter. Tones may be played in either idle or dedicated 

mode. 

On completion of the current tone, unsolicited result code +STTONE: 0 will be issued by the CI 

Task. However, if =0 is used to terminate the tone before it has completed playing there 

will be no unsolicited result code but only a result code of OK generated by the CI Task. 

AT+STTONE SIM Toolkit PLAY TONE COMMAND 


AT+STTONE=? 


Response 

+STTONE: (list of supported s),(list of supported s), 

+CME ERROR: 

Response 

+CME ERROR: 





Parameter 

0 Stop playing tone 

1 Start playing tone 

numeric type 

1 Dial Tone 

2 Called Subscriber Busy 

3 Congestion 

4 Radio Path Acknowledge 


5 Radio Path Not Available / Call Dropped 

6 Error / Special information 

7 Call Waiting Tone 

8 Ringing Tone 

16 General Beep 

17 Positive Acknowledgement Tone 

18 Negative Acknowledgement or Error Tone 

19 Indian Dial Tone 

< Duration> numeric type, in milliseconds. 

Max requested value = 255*60*1000 = 15300000ms 

(supported range = 1- 15300000) 

The default , if none entered, is General Beep. 

The default , if none entered, is 500ms. 

6.4.8 AT+HSTK Terminate All STK action 

AT+HSTK Terminate All STK action 

Execution Command 

AT+HSTK 

Response 

OK 

Reference Note: 

All STK action will be terminated after execute this command 

7 AT Commands Special for SIMCOM 

7.1 Overview 


AT+ECHO ECHO CANCELLATION CONTROL 

AT+ SIDET CHANGE THE SIDE TONE GAIN LEVEL 

AT+CPOWD POWER OFF 

AT+SPIC TIMES REMAIN TO INPUT SIM PIN/PUK 

AT+CMIC CHANGE THE MICOPHONE GAIN LEVEL 

AT +UART CONFIGURE DUAL SERIAL PORT MODE



AT+CALARM SET ALARM 

AT+CADC READ ADC 

AT +CSNS SINGLE NUMBERING SCHEME 

AT +CDSCB RESET CELLBROADCAST 

AT +CMOD CONFIGRUE ALTERNATION MODE CALLS 

AT +CFGRI INDICATE RI WHEN USING URC 

AT+CLTS GET LOCAL TIMESTAMP 

AT+CEXTHS EXTERNAL HEADSET JACK CONTROL 

AT+CEXTBUT HEADSET BUTTON STATUS REPORTING 

AT+CSMINS SIM INSERTED STATUS REPORTING 

AT+CLDTMF LOCAL DTMF TONE GENERATION 

AT+CDRIND CS VOICE/DATA/FAX CALL OR GPRS PDP CONTEXT 

TERMINATION INDICATION 

AT+CSPN GET SERVICE PROVIDER NAME FORM SIM 

AT+CCVM GET AND SET THE VOICE MAIL NUMBER ON THE SIM 

AT+CBAND GET AND SET MOBILE OPERATION BAND 

AT+CHF CONFIGURES HANDS FREE OPERATION 

AT+CHFA SWAP THE AUDIO CHANNELS 

AT+CSCLK CONFIGURE SLOW CLOCK 

AT+CENG SWITCH ON OR OFF ENGINEERING MODE 

AT+SCLASS0 STORE CLASS 0 SMS TO SIM WHEN RECEIVED CLASS 0 

SMS 

AT+CCID SHOW ICCID 

AT+CGMSCLASS SET GPRS MULTISLOT CLASS 

7.2 Detailed Descriptions of Commands 

7.2.1 AT+ECHO Echo cancellation control 

AT+ECHO Echo cancellation control 


AT+ECHO? 


AT+ECHO=? 

Response : 

+ECHO(NORMAL_AUDIO): 

,, 

+ECHO(AUX_AUDIO): 

,, 

ok 

Parameter: 


Response : 

+ECHO: (voxGain),( minMicEnergy) ,( sampSlncePrd).(channel) 

ok 





AT+ECHO= 

,,, 

Parameter: 


Response : 

ok 

Parameter: 


< voxGain > int: 0 – 32767 

< minMicEnergy > int: 0 – 32767 

< sampSlncePrd > int: 0 – 32767 

int 0-1 

1 AUX_AUDIO 

0 NORMAL_AUDIO 

< voxGain >: the parameter models the acoustic path between ear-piece and 

microphone. 

< minMicEnergy >: the parameter sets the minimum microphone energy 

level to beattained before suppression is allowed. A typical value of this 

parameter is 20. 

< sampSlncePrd >: the parameter control the minimum number of speech 

frames that will be replace with SID frames when an echo is detected. A 

typical value of this parameter is 4. 

7.2.2 AT+SIDET Change the side tone gain level 

AT+SIDET Change the side tone gain level 


AT+SIDET? 


AT+SIDET=? 


AT+SIDET=< 

Response: 

+ SIDET: < gainlevel> 

OK 

Parameter: 


Response: 

+SIDET: (gainlevel) 

OK 

Parameter: 


Response: 

OK 

gainlevel > Parameters 


< gainlevel > int: 0 – 32767 

The relation between the Side Tone Gain and is 

Side Tone Gain/dB = 20*log(sideTone/32767) 




7.2.3 AT+CPOWD Power Off 

AT+CPOWD Power Off 


AT+CPOWD = 


Response: 

NORMAL POWER DOWN 

Parameters 

n: 1 Normal power off ( Will disconnect from network) 

7.2.4 AT+SPIC Times remain to input SIM PIN/PUK 

AT+SPIC Times remain to input SIM PIN/PUK 


AT+SPIC 

Reference 

Response 

Times remain to input SIM PIN 

+SPIC: ,,, 

OK 

Parameters 

: Times remain to input chv1 

:Times remain to input chv2 

: Times remain to input puk1 

: Times remain to input puk2 

7.2.5 AT+CMIC Change the microphone gain level 

AT+CMIC Change the microphone gain level 


AT+CMIC? 


AT+CMIC=? 

Set Command 

AT+CMIC= 

Response : 

+ CMIC: < gainlevel(Main_Mic) >, 

OK 

Parameter: 


Response : 

+CMIC: list of supported s, list of supported < gainlevel >s 

ok 

Parameter: 


Response : 

Ok 




,< 

gainlevel> 

Parameter: 


0 – Main Microphone 

1 – Aux Microphone 

< gainlevel > int: 0 – 15 

0 0dB 

1 +1.5dB 

2 +3.0 dB(default value) 

3 +4.5 dB 

4 +6.0 dB 

5 +7.5 dB 

6 +9.0 dB 

7 +10.5 dB 

8 +12.0 dB 

9 +13.5 dB 

10 +15.0 dB 

11 +16.5 dB 

12 +18.0 dB 

13 +19.5 dB 

14 +21.0 dB 

15 +22.5 dB 

7.2.6 AT+UART Configure dual serial port mode 

AT+UART Configure dual serial port mode 


AT+UART? 


AT+UART=[,] 

Response 

+UART: 

Ok 

Parameter: 

See Write Command 

Response 

Ok 

Error 




Reference 

Parameter 

7.2.7 AT+CALARM Set alarm 

AT+CALARM Set alarm 


AT+CALAR 

M=? 


AT+CALAR 

M= 

,,, 

currentUart 

1 use serial line 1 

2 use serial line 2(gprs) 


4 last commond use serial line 1 

5 last commond use serial line 2 

Uart 


2 use serial line 2(gprs) 


Baud ( If uart is 2 or 3) 

9600,19200,28800,38400,57600,115200 

Response : 

+ CALARM: ,,, 

ok 

Parameter: 


Response : 

ok 

Parameter: 

< state > an integer parameter which indicates whether enable or disable 

alarm. 

0 CLEAR ALARM 

1 SET ALARM 

< time > a string parameter which indicates the time when alarm arrives. 


The format is “yy/MM/dd,hh:mm:ss+-zz” where characters 

indicate the last two digits of year, month, day, hour, minute, 

second and time zone. The time zone is expressed in quarters of 

an hour between the local time and GMT, ranging from -47 to 

+48. 

< repeat > an integer parameter which indicates the repeat mode 

0 None 

1 Daily 

2 Weekly 

3 Monthly 

an integer parameter which indicates the method of dealing power




7.2.8 AT+CADC Read ADC 

AT+CADC Read ADC 


AT+ CADC? 


AT+CADC=? 

when alarm arrives. 

0 None 

Only send “ALARM RING” to serial port 

1 Alarm power off 


Send “ALARM RING” to serial port and power off in 5 seconds 

2 Alarm power on 

Send “ALARM MODE” to serial port and enter into alarm mode 

Note: In alarm mode, protocol stack and SIM protocol is closed, only a few AT 

command can be executed, and system will be powered down after 90 seconds 

if neither power key is pressed nor functionality is changed to full 

functionality. If power key is pressed, system will be powered down right now. 

Response : 

+ CADC: < status>, 

OK 

Parameter: 

See test command 

Response : 

+ CADC: list of supported s, list of supported s> 

OK 

Parameter: 

 

1 success 

0 fail 

integer 0-2400 

Note: 

7.2.9 AT+CSNS Single numbering scheme 

AT+CSNS Single numbering scheme 

Test command Response : 

AT+ CSNS =? +CSNS:(list of supported modes) 


AT+ CSNS? 

Parameter 

Response : 

+CSNS:




AT+ 

CSNS= 

Reference 

Parameter: 

Response : 

Ok 

Error 

Parameter: 

 

0 voice 

2 fax 

4 data 

Note 

7.2.10 AT+CDSCB Reset cell broadcast 

AT+CDSCB Reset cell broadcast 


AT+ CDSCB 

Reference 

Response : 

OK 

Parameter: 

Note 

Reset the CB module 

7.2.11 AT+CMOD Configures alternating mode calls 

AT+CMOD Configures alternating mode calls 


AT+ CMOD =? 


AT+CMOD= Parameter: 

Reference 

 

0 

Note 

7.2.12 AT+CFGRI Indicate RI when using URC 

AT+CFGRI Indicate RI when using URC 


AT+ CFGRI ? 

Response : 

+CFGRI: 

ok 






Parameter: 


Response : 

OK 

CFGRI= Parameter: 

Reference 

 

0 on 

1 off 

Note 

7.2.13 AT+CLTS Get local timestamp 

AT+CLTS Get local timestamp 


AT+CLTS=? 


AT+CLTS 

Reference 

Response 

+CLTS: (the format of timestamp) 

Parameters 


Parameter 


Response 

+CLTS:(timestamp) 

Parameters 

a string parameter which indicates the local timestamp. The 

Note 


format of timestamp is "yy/MM/dd,hh:mm:ss+/-zz" 

yy: year 

MM: month 

dd: day 

hh: hour 

mm: minute 

ss: second 

zz: time zone 

Support for this command will be network dependant 

7.2.14 AT+CEXTHS External headset jack control 

AT+ CEXTHS External headset jack control 


AT+CEXTHS=? 

Response 

+CEXTHS: 

Parameters 





AT+CEXTHS? 


AT+CEXTHS=< 

mode> 

Reference 

Response 

+CEXTHS:, 

Parameter 


Response 

OK 

ERROR 

Unsolicited result code: 

+CEXTHS:, 

Parameters 

a numeric parameter which indicates whether an 


unsolicited event code (indicating whether the 

headset has been attached/detached) should be sent 

to the terminal. 

0 not send unsolicited event code 

1 send unsolicited event code 

a numeric parameter which indicates whether a 

Note 

headset has been attached or not 

0 not attached 

1 attached 

Support for this command will be hardware dependant 

7.2.15 AT+CEXTBUT Headset button status reporting 

AT+ CEXTBUT Headset button status reporting 


Response 

AT+CEXTBUT= +CEXTBUT: 

? Parameters 



AT+CEXTBUT? 


AT+CEXTBUT= 

 

Response 

+CEXTBUT:, 

Parameter 


Response 

OK 

ERROR 


+CEXTBUT:,



Reference 

Parameters 

a numeric parameter which indicates whether an 

unsolicited event code (indicating whether the 

headset button has been pressed) should be sent to 

the terminal. 

0 not send unsolicited event code 

1 send unsolicited event code 

a numeric parameter which indicates whether a 

headset button has been pressed or not 

0 not pressed 

1 pressed 

Note 

Support for this command will be hardware dependant 

7.2.16 AT+CSMINS SIM inserted status reporting 

AT+ CSMINS SIM inserted status reporting 


AT+CSMINS=? 


AT+CSMINS? 


AT+CSMINS=[< 

n>[,]] 

Reference 

Response 

+CSMINS: (list of supported s) 

Parameters 


Response 

+CSMINS:, 

Parameter 


Response 

OK 

ERROR 

Parameters 

a numeric parameter which indicates whether to show an 

unsolicited event code indicating whether the SIM has just been 

inserted or removed. 

0 disable 

1 enable 

< SIM inserted> a numeric parameter which indicates whether SIM 

card has been inserted. 

0 not inserted 

1 inserted 

Note 




7.2.17 AT+CLDTMF Local DTMF tone generation 

AT+ CLDTMF Local DTMF tone generation 


AT+CLDTMF=[ 

[,]] Parameters 


AT+CLDTMF 

Reference 

GSM07.07 

a numeric parameter(1-255(ms)) which indicates the 


duration of all DTMF tones in < DTMF -string> in 1/10 

secs 

< DTMF -string> a string parameter which has a max length of 20 chars 

of form < DTMF >, separated by commas. 

< DTMF > A single ASCII chars in the set 0-9,#,*,A-D. 

Response 

OK 

Aborts any DTMF tone currently being generated and 

any DTMF tone sequence. 

Note 

7.2.18 AT+CDRIND CS voice/data/fax call or GPRS PDP context termination indication 

AT+ CDRIND CS voice/data/fax call or GPRS PDP context termination indication 


AT+CDRIND=? 


AT+CDRIND? 


AT+CDRIND=< 

n> 

Reference 

Response 

+CDRIND: (list of supported s) 

Parameters 


Response 

+CDRIND: 

Parameter 


Response 

OK 

ERROR 

Parameters 

a numeric parameter which indicates whether to enable an 

Note 

unsolicited event code indicating whether a CS voice call, CS 

data, fax call or GPRS session has been terminated. 

0 disable 

1 enable



7.2.19 AT+CSPN Service Provider Name (from SIM) 

AT+CSPN Service Provider Name (from SIM) 


AT+CSPN? 


Response: 

+CSPN: , 

+CME ERROR: 

Parameters 

string type; service provider name on SIM 

0 – don’t display PLMN. Already registered on 

PLMN 

1 – display PLMN 

CME errors possible if SIM not inserted or PIN not entered. 

7.2.20 AT+CCVM Read and write the voice mail number on the SIM 

AT+CCVM Read and write the voice mail number on the SIM 


AT+CCVM? 


AT+CCVM=? 


AT+CCVM=[,] 

Response 

+CCVM: [,] 

Parameter 


Response 

+CCVM: [,] 

Parameter 


Response 

+CME ERROR: 

Parameters 


String Type -The voice mail number to write to the SIM 

String Type -The alpha-string to write to the SIM 

CPHS voice mail only currently available on Orange SIMS 

7.2.21 AT+CBAND Get and Set Mobile Operating Band 

AT+CBAND Get and Set Mobile Operating Band 


AT+CBAND? 


AT+CBAND=? 

Response 

+CBAND: < op_band > 

Parameter 


Response 

+CBAND: (list of supported s) 

Parameter 






AT+CBAND= 

Response 

OK 

ERROR 

Parameters 


 


PGSM_MODE 

DCS_MODE 

PCS_MODE 

EGSM_DCS_MODE 

GSM850_PCS_MODE 

Radio settings following updates are stored in non-volatile memory. 

7.2.22 AT+CHF Configures hands free operation 

AT+CHF Configures hands free operation 


AT+CHF? 


AT+CHF=, 

Reference 

Response 

+CHF: , 


+CHF: 

Parameters 

See write command. 

Response 

+CME ERROR: 

Parameters 

0 Unsolicited result code disabled 

1 Unsolicited result code enabled 

(non-volatile) 

0 Hands free operation disabled 

1 Hands free operation enabled 

(volatile) 

7.2.23 AT+CHFA Swap the audio channels 

AT+ CHFA Swap the audio channels 


AT+ CHFA? 


AT+ CHFA=? 

Response 

+ CHFA: 

Parameters 


Response 

+CHFA: (0 = NORMAL_AUDIO, 1 = AUX_AUDIO)




AT+CHFA= 

Parameters 


Response 

OK 

+CME ERROR: 

Parameters 

Reference NOTE 

0 – Normal audio channel(default) 

1 – Aux audio channel 

This command swaps the audio channels between the normal channel and 

the aux channel. 

7.2.24 AT+CSCLK Configure Slow Clock 

AT+ CSCLK Configure Slow Clock 


AT+ CSCLK? 


AT+ CSCLK=? 


AT+ CSCLK 

= 

Response 

+CSCLK: 

Parameters 


Response 

+CSCLK: (0,1) 

Parameters 


Response 

OK 

ERROR 

Parameters 


0 – disable slow clock 

1 – enable slow clock 

7.2.25AT+CENG Switch On or Off Engineering Mode 

AT+ CENG Switch On or Off Engineering Mode 





AT+ CENG? 


AT+ CENG=? 


AT+ CENG 

= 

Response 

Engineering Mode is designed to allow a field engineer to view and test 

the network information received by a handset, when the handset is 

either in idle mode or dedicated mode (that is: with a call active). In each 

mode, the engineer is able to view network interaction for the “serving 

cell” (the cell the handset is currently registered with) or for the 

neighbouring cells. 

TA returns the current engineering mode. The network information 

including serving cell and neighbouring cells are returned only when 

=1 or = 2. carry with them corresponding 

network interaction. 

+CENG: 

[+CENG: 

,”,,,,,,,< rla >,< txp 

>” 

+CENG: ,”,,” 

…] 

Parameters 


Response 

TA returns the list of supported modes. 

+CENG: list of supported s OK 

Parameters 


Response 

TA attempt to switch on or off engineering mode.GSM network operator. 

TA controls the presentation of an unsolicited result code +CENG: (network 

information) when =2 and there is a change of network 

information . 

OK 

ERROR 

Parameters 

0 switch off engineering mode 

1 switch on engineering mode 

2 switch on engineering mode, and activate the 

unsolicited reporting of network information. 

0 the serving cell 

1-6 the index of the neighbouring cell. 

absolute radio frequency channel number. 

receive level. 

receive quality. 

mobile country code. 





mobile network code. 

base station identity code. 

cell id. 

receive level access minimum. 

transmit power maximum CCCH. 

7.2.26 AT+SCLASS0 Store Class 0 SMS 

AT+ SCLASS0 Store Class 0 SMS 


AT+ SCLASS0? 



Response 

+ SCLASS0: 

Parameters 


Response 

SCLASS0=? Parameters 


AT+SCLASS0=< 

mode> 

+SCLASS0: (0 = DISABLE, 1 =ENABLE) 


Response 

OK 

ERROR 

Parameters 

 


7.2.27 AT+CCID Show ICCID 

AT+CCID Show ICCID 


AT+ CCID =? 

Execute Command 

AT+ CCID 

Response: 

OK 

Response: 


0 – disable to store Class 0 SMS to SIM when received Class 0 SMS 

1 – Enable to store Class 0 SMS to SIM when received Class 0 SMS 

Ccid data[ex. 898600910903:0513918] 

OK 

Parameters 

Reference Note



7.2.28AT+CMTE Read Temperature Of Module 

AT+CMTE Read Temperature Of Module 

Execute Command 

AT+ CMTE? 

Reference 

Response: 

+CMTE: 

OK 

Parameters 

< Temperature> range of -40 to 90 

Note 

7.2.29 AT+CSDT Switch On Or Off Detecting SIM Card 

AT+ CSDT Switch On Or Off Detecting SIM Card 


AT+ CSDT? 


AT+ CSDT =? 


AT+CSDT= 

Response 

+CSDT: 

Parameters 

Response 

+CSDT: (0-1) 

Parameters 


Response 

OK 

ERROR 

Parameters 

 


7.2.30 AT+CMGDA Delete All SMS 

AT+ CMGDA Delete All SMS 


AT+ CMGDA=? 

Response: 

0 – switch off detecting SIM card 

1 – switch on detecting SIM card 

+CMGDA: listed of supported s 

OK 

+CMS ERROR: NUM 

Parameters 






AT+CMGDA= 

Reference 

Response: 

OK 

+CMS ERROR: NUM 

Parameters 

1) If text mode: 

“DEL READ” delete all read messages 

“DEL UNREAD” delete all unread messages 

“DEL SENT” delete all sent SMS 

“DEL UNSENT” delete all unsent SMS 

“DEL INBOX” delete all received SMS 

“DEL ALL” delete all SMS 

3) if PDU mode : 

1 delete all read messages 

2 delete all unread messages 

3 delete all sent SMS 

4 delete all unsent SMS 

5 delete all received SMS 

6 delete all SMS 

Note 

7.2.31 AT+ CGMSCLASS SET GPRS MULTISLOT CLASS 

AT+ CGMSCLASS SET GPRS MULTISLOT CLASS 



Response 

CGMSCLASS? Parameters 



MULTISLOT CLASS: 


Response 

CGMSCLASS=? Parameters 



CGMSCLASS 

= 

MULTISLOT CLASS: 1-10 


Response 

OK 

ERROR 

Parameters 


1-10 




8 AT Commands for TCPIP Application Toolkit 

8.1 Overview 


AT+CIPSTART START UP TCP OR UDP CONNECTION 

AT+CIPSEND SEND DATA THROUGH TCP OR UDP CONNECTION 

AT+CIPCLOSE CLOSE CONNECTION 

AT+CIPSHUT DEACTIVATE GPRS PDP CONTEXT 

AT+CLPORT SET LOCAL PORT 

AT+CSTT SET APN, USER NAME, PASSWORD 

AT+CIICR BRING UP WIRELESS CONNECTION WITH GPRS OR CSD 

AT+CIFSR GET LOCAL IP ADDRESS 

AT+CIPSTATUS QUERY CURRENT CONNECTION STATUS 

AT+CDNSCFG CONFIGURE DOMAIN NAME SERVER 

AT+CDNSGIP QUERY IP ADDRESS OF GIVEN DOMAIN NAME 

AT+CDNSORIP CONNECT WITH IP ADDRESS OR DOMAIN NAME SERVER 

AT+CIPHEAD ADD AN IP HEADER WHEN RECEIVING DATA 

AT+CIPATS SET AUTO SENDING TIMER 

AT+CIPSPRT SET PROMPT OF ‘>’ WHEN SENDING DATA 

AT+CIPSERVER CONFIGURE AS SERVER 

AT+CIPCSGP SET CSD OR GPRS FOR CONNECTION MODE 

AT+CIPCCON CHOOSE CONNECTION 

AT+CIPFLP FIX LOCAL PORT 

AT+CIPSRIP SHOW WHERE RECEIVED DATA FROM 

AT+CIPDPDP SET WHETHER CHECK STATE OF GPRS NETWORK TIMING 

AT+CIPSCONT SAVE TCPIP APPLICATION CONTEXT 

AT+CIPMODE SELECT TCPIP APPLICATION MODE 

AT+CIPCCFG CONFIGURE TRANSPARENT TRANSFER MODE 

8.2 Detailed Descriptions of Commands 

8.2.1 AT+CIPSTART Start up TCP or UDP connection 

AT+CIPSTART Start up TCP or UDP connection 


+CIPSTART=? 

Response 

+CIPSTART: (list of supported ),(IP address range),(port range) 

+CIPSTART: (list of supported ),(domain name),(port 

range) 

OK 

Parameter 





+CIPSTART=,[,], 

Reference 


Response 

If format is right response OK, otherwise response ERROR 

If connect successfully response CONNECT OK 

Otherwise 

STATE: 

CONNECT FAIL 

Parameter 

a string parameter which indicates the connection type 


“TCP” Establish a TCP connection 

“UDP” Establish a UDP connection 

remote server IP address 

remote server port 

remote server domain name 

a string parameter which indicates the progress of 

Parameter 

connecting 

0 IP INITIAL 

1 IP START 

2 IP CONFIG 

3 IP IND 

4 IP GPRSACT 

5 IP STATUS 

6 TCP/UDP CONNECTING 

7 IP CLOSE 

8 CONNECT OK 

8.2.2 AT+CIPSEND Send data through TCP or UDP connection 

AT+CIPSEND Send data through TCP or UDP connection 


+CIPSEND=? 


+CIPSEND 

response”> ”, then 

type data for send, 

tap CTRL+Z to 

send 

Response 

OK 

Response 

This command is used to send changeable length data. 

If connection is not established or disconnection: 

ERROR 

If sending successfully: 

SEND OK 

If sending fail: 

SEND FAIL 

Note 

This command is used to send data on the TCP or UDP connection that has 

been established already. Ctrl-Z is used as a termination symbol. There are 

at most 1024 bytes that can be sent at a time.




+CIPSEND= 

Reference 

Response 

This command is used to send fixed length data. 

If connection is not established or disconnect: 

ERROR 

If sending successfully: 

SEND OK 

If sending fail: 

SEND FAIL 

Parameter 

a numeric parameter which indicates the length of 

sending data, it must less than 1024 

Note 

1. There are at most 1024 bytes that can be sent each time. 

2. Set the time that send data automatically with the command of 

AT+CIPATS. 

3. Only send data at the status of established connection, otherwise 

Response ERROR 

8.2.3 AT+CIPCLOSE Close TCP or UDP Connection 

AT+CIPCLOSE Close connection 


+CIPCLOSE=? 


+CIPCLOSE 

Reference 

Response 

+CIPCLOSE: 

OK 

Response 

If close successfully: 

CLOSE OK 

If close fail: 

ERROR 

Note 

AT+CIPCLOSE only close connection at the status of TCP/UDP 

CONNECTING or CONNECT OK,otherwise response ERROR, after 

close the connection, the status is IP CLOSE 

8.2.4 AT+CIPSHUT Disconnect wireless connection 

AT+CIPSHUT Disconnect wireless connection 


+CIPSHUT=? 

Response 

+CIPSHUT: 

OK 

Read command Response 




+CIPSHUT? +CIPSHUT: 


+CIPSHUT 

Reference 

OK 

Response 

If close successfully: 

SHUT OK 

If close fail: 

ERROR 

Note Except at the status of IP INITIAL, you can close moving scene by 

AT+CIPSHUT. After closed, the status is IP INITIAL. 

Note 

8.2.5 AT+CLPORT Set local port 

AT+CLPORT Set local port 


+CLPORT=? 


+CLPORT? 


+CLPORT=, 

Reference 

Response 

+CLPORT: (list of supported s) 

Parameter 


Response 

: 

: 

Parameter 


Response 

OK 

ERROR 

Parameter 

a string parameter which indicates the connection type 

“TCP” TCP local port 

“UDP” UDP local port 

a numeric parameter which indicates the local port 

Note 

8.2.6 AT+CSTT START task and Set APN、USER ID、PASSWORD 

AT+CSTT Start task and Set APN、USER ID、PASSWORD 


+CSTT=? 


+CSTT? 

Response 

+CSTT: "APN","USER","PWD" 

OK 

Response 

+CSTT: ,, 

OK 





+CSTT=,< 

user 

id>, 


+CSTT 

Reference 

Parameter 


Response 

OK 

ERROR 

Parameter 

a string parameter which indicates the GPRS access point name 

a string parameter which indicates the GPRS user name 

a string parameter which indicates the GPRS password 

Response 

OK 

ERROR 

Note 

8.2.7 AT+CIICR Bring up wireless connection with GPRS or CSD 

AT+CIICR Bring up wireless connection with GPRS or CSD 


+CIICR=? 


+CIICR 

Reference 

Response 

OK 

Response 

OK 

STATE: 

ERROR 

Parameter 

referred to AT+CIPSTART 

Note 

8.2.8 AT+CIFSR Get local IP address 

AT+CIFSR Get local IP address 


+CIFSR=? 


+CIFSR? 

AT+CIICR only activate moving scene at the status of IP START,after 

operate this command, the state changed to IP CONFIG. If module 

accept the activate operation, the state changed to IP IND; after module 

accept the activate operation, if activate successfully, the state changed 

to IP GPRSACT, response OK, otherwise response ERROR. 

Response 

+CIFSR: 

OK 

Response 

+CIFSR: 

OK 

Execution command Response 




+CIFSR 

Reference 

 

OK 

ERROR 

Parameter 

a string parameter which indicates the IP address assigned 

Note 

from GPRS or CSD 

Only at the status of activated the moving scene: IP GPRSACT、 

TCP/UDP CONNECTING、CONNECT OK、IP CLOSE can get local IP 

Address by AT+CIFSR, otherwise response ERROR. 

8.2.9 AT+CIPSTATUS Query current connection status 

AT+CIPSTATUS Query current connection status 


+CIPSTATUS=? 


+CIPSTATUS? 


+CIPSTATUS 

Reference 

Response 

+CIPSTATUS: 

OK 

Response 

+CIPSTATUS: 

OK 

Response 


OK 

Parameter 

referred to AT+CIPSTART 

Note 

8.2.10 AT+CDNSCFG Configure domain name server 

AT+CDNSCFG Configure domain name server 


+CDNSCFG=? 


+CDNSCFG? 


+CDNSCFG=, 

Response 

+CDNSCFG: 

("(0,255).(0,255).(0,255).(0,255)"),("(0,255).(0,255).(0,255).(0,255)") 

OK 

Response 

+CDNSCFG: ("PRIMARY DNS"),("SECONDARY DNS") 

Response 

OK 

ERROR 

Parameter 




Reference 

a string parameter which indicates the IP address of the 

primary domain name server 

a string parameter which indicates the IP address of the 

secondary domain name server 

Note 

8.2.11 AT+CDNSGIP Query the IP address of given domain name 

AT+CDNSGIP Query the IP address of given domain name 


+CDNSGIP=? 


+CDNSGIP? 


+CDNSGIP= 

Reference 

Response 

+CDNSGIP: DOMAIN NAME LENGTH(0,100) 

OK 

Response 

+CDNSGIP: ("DOMAIN NAME") 

ok 

Response 

OK 

ERROR 

If successful, return: 

 

If fail, return: 

ERROR: 


Parameter 

a string parameter which indicates the domain name 

a string parameter which indicates the IP address 


corresponding to the domain name 

a numeric parameter which indicates the error code 

1 DNS not Authorization 

2 invalid parameter 

3 network error 

4 no server 

5 time out 

6 no configuration 

7 no memory 

refer to AT+CIPSTART 

Note 

8.2.12 AT+CDNSORIP Connect with IP address or domain name server 

AT+CDNSORIP Connect with IP address or domain name server 


+CDNSORIP=? 

Response 

+CDNSORIP: (list of supported s)




+CDNSORIP? 


+CDNSORIP= 

Reference 

OK 

Parameter 


Response 

+CDNSORIP: 

OK 

Parameter 


Response 

OK 

ERROR 

Parameter 

a numeric parameter which indicates whether connecting 

with IP address server or domain name server 

0 remote server is an IP address 

1 remote server is a domain name 

Note 

8.2.13 AT+CIPHEAD Add an IP head when receiving data 

AT+CIPHEAD Add an IP head when receiving data 


+CIPHEAD=? 


+CIPHEAD? 


+CIPHEAD= 

Reference 

Response 

+CIPHEAD: (list of supported s) 

Parameter 


Response 

+CIPHEAD: 

Parameter 


Response 

OK 

ERROR 

Parameter 

a numeric parameter which indicates whether adding an IP 

header to received data or not 

0 not add IP header 

1 add IP header, the format is “+IPD(data length):” 

Note 




8.2.14 AT+CIPATS Set auto sending timer 

AT+CIPATS Set auto sending timer 


+CIPATS=? 


+CIPATS? 


+CIPATS=, 

Reference 

Response 

+CIPATS: (list of supported s) 

OK 

Parameter 


Response 

+CIPATS: 

Parameter 


Response 

OK 

ERROR 

Parameter 

a numeric parameter which indicates whether set timer 

when sending data 


0 not set timer when sending data 

1 Set timer when sending data 

a numeric parameter which indicates the seconds after 

Note 

which the data will be sent 

8.2.15 AT+CIPSPRT Set prompt of ‘>’ when sending data 

AT+CIPSPRT Set prompt of ‘>’ when sending data 


+CIPSPRT=? 


+CIPSPRT? 


+CIPSPRT= 

Response 

+CIPSPRT: () 

Parameter 


Response 

+CIPSPRT: 

Parameter 


Response 

OK 

ERROR 

Parameter 

a numeric parameter which indicates whether echo prompt 

‘>’ after issuing AT+CIPSEND command 

0 no prompt and show “send ok” when send successfully 

1 echo ‘>’ prompt and show “send ok” when send successfully 

2 no prompt and not show “send ok” when send successfully



Reference 

Note 

8.2.16 AT+CIPSERVER Configure as a server 

AT+CIPSERVER Configure as a server 


+CIPSERVER? 


+CIPSERVER 

Reference 

Response 

 

OK 

Parameter 

0 has not been configured as a server 

1 has been configured as a server 

Response 

OK 

ERROR 

If configuration as server success, return: 

SERVER OK 

If configuration as server fail, return: 

STATE: 

CONNECT FAIL 

Parameter 

refer to AT+CIPSTART 

Note 

8.2.17 AT+CIPCSGP Set CSD or GPRS connection mode 

AT+CIPCSGP Set CSD or GPRS for connection mode 


+CIPCSGP=? 


+CIPCSGP? 


+CIPCSGP=,[(, 

, 

), 

Response 

+CIPCSGP: (list of supported connection s),[(GPRS parameters 

,,),(CSD parameters ,,,)] 

OK 

Parameter 


Response 

+CIPCSGP: 

OK 

Parameter 


Response 

OK 

ERROR 

Parameter 

a numeric parameter which indicates the wireless connection 




(,,, 

)] 

Reference 

mode 

0 set CSD as wireless connection mode 

1 set GPRS as wireless connection mode 

GPRS parameters: 

a string parameter which indicates the access point name 

a string parameter which indicates the user name 

a string parameter which indicates the password 

CSD parameters: 

a string parameter which indicates the CSD dial numbers 

a string parameter which indicates the CSD USER ID 

a string parameter which indicates the CSD password 

a numeric parameter which indicates the CSD connection 

Note 

rate 

8.2.18 AT+CIPCCON Choose connection 

AT+CIPCCON Choose connection 


+CIPCCON=? 


+CIPCCON? 


+CIPCCON= 

Reference 

Response 

+CIPCCON: (list of supported s) 

OK 

Parameter 


Response 

 

OK 

Parameter 


Response 

OK 

ERROR 

Parameter 

a numeric parameter which indicates the chosen connection 

1 choose connection as client 

2 choose connection as server 

Note that there may exist two connections at one time: one connection is as 

client connecting with remote server, the other connection is as server 

connecting with remote client. Using this command to choose through 

which connection data is sent. 

Note 




8.2.19 AT+CIPFLP Set whether fix the local port 

AT+CIPFLP Set whether fix the local port 


+CIPFLP=? 


+CIPFLP? 


+CIPFLP= 

Reference 

Response 

+CIPFLP: (list of supported s) 

Parameter 


Response 

+CIPFLP: 

OK 

Parameter 


Response 

OK 

ERROR 

Parameter 

a numeric parameter which indicates whether increasing 


local port automatically when establishing a new 

connection 

0 do not fix local port, increasing local port by 1 when 

establishing a new connection 

1 fix local port, using the same port when establishing a 

new connection 

Note that in default mode, the local port is fixed. It can speed up the 

connection progress if setting to not fixed local port when establishing a 

new connection after closing previous connection. 

Note 

8.2.20 AT+CIPSRIP Set whether display IP address and port of sender when receive data 

AT+CIPSRIP Set whether display IP address and port of sender when receive data 


+CIPSRIP=? 


+CIPSRIP? 

Response 

+CIPSRIP: (list of supported s) 

OK 

Parameter 


Response 

: 

OK 

Parameter 

See set command




+CIPSRIP= 

Reference 

Response 

OK 

ERROR 

Parameter 

a numeric parameter which indicates whether show the 

prompt of where the data received are from or not before 

received data. 

0 do not show the prompt 

1 show the prompt, the format is as follows: RECV 

FROM:: 

Note that the default mode is not to show the prompt. 

Note 

8.2.21 AT+CIPDPDP Set Whether Check State Of GPRS Network Timing 

AT+CIPDPDP Set Whether Check State Of GPRS Network Timing 


+CIPDPDP =? 


+CIPDPDP? 


+CIPDPDP=,, 

Reference 

Response 

+CIPDPDP:(list of supported< mode>s) 

OK 

Parameter 


Response 

+CIPDPDP:,, 

+CIPCPCP: 0 

OK 

Parameter 


Response 

OK 

ERROR 

Parameter 

 

0 not set detect PDP 

1 set detect PDP 

 

0



8.2.22 AT+CIPSCONT Save TCPIP Aplicaton Context 

AT+CIPSCONT Save TCPIP Application Context 


AT+CIPSCONT? 

Response 

TA returns TCPIP Application Context, which consists of the following AT Command 

parameters. 

SHOW APPTCPIP CONTEXT 

+CDNSORIP: 

+CIPSPRT:< sendprompt> 

+CIPHEAD: 

+CIPFLP: 

+CIPSRIP: 

+CIPCSGP: 

Gprs Config APN: 

Gprs Config UserId: 

Gprs Config Password: 

Gprs Config inactivityTimeout: 

CSD Dial Number: 

CSD Config UserId: 

CSD Config Password: 

CSD Config rate: 

+CIPDPDP: 

Detect PDP Inerval: 

Detect PDP Timer: 

OK 

Parameters 

see AT+CDNSORIP 

see AT+CIPSPRT 

see AT+CIPHEAD 

see AT+CIPFLP 

see AT+CIPSRIP 

see AT+CIPCSGP 









see AT+CIPDPDP 







AT+CIPSCONT 

Response 

TA saves TCPIP Application Context which consist of following AT command parameters, and 

when system is rebooted, the parameters will be loaded automatically: 

OK 

Parameter 


AT+CDNSORIP, AT+CIPSPRT, AT+CIPHEAD, 

AT+CIPFLP,AT+CIPSRIP, AT+CIPCSGP, 

AT+CIPDPDP 

8.2.23 AT+CIPMODE Select TCPIP Application mode 

AT+CIPMODE Select TCPIP Application mode 


+CIPMODE=? 


+CIPMODE? 


+CIPMODE= 


+CIPMODE 

Reference 

Response 

+CIPMODE: (0,1) 

OK 

Response 

+CIPMODE: 

OK 

Parameter 


Response 

OK 

ERROR 

Parameter 

0:command mode 

1:transparent transfer mode 

Response 

ERROR 

Note 

8.2.24 AT+CIPCCFG Configure Transparent Transfer mode 

AT+CIPCCFG Configure Transparent Transfer Mode 


+CIPCCFG=? 


+CIPCCFG? 

Response 

+CIPCCFG: ,,, 

OK 

Response 

+CIPCCFG: ,,, 

OK 

Parameter




+CIPCCFG=, 

,, 


+CIPCCFG 

Reference 


Response 

OK 

ERROR 

Parameter 

number of retries to be made for an IP packet. 

number of 200ms intervals to wait for serial input 

before sending the packet. 

size in bytes of data block to be received from serial 

port before sending. 

whether turn on the escape sequence, default is 

Response 

ERROR 

Note 

TRUE. 

9 Supported unsolicited result codes 

9.1 Summary of CME ERROR Codes 

Final result code +CME ERROR: indicates an error related to mobile equipment or network. 

The operation is similar to ERROR result code. None of the following commands in the same 

command line is executed. Neither ERROR nor OK result code shall be returned. 

values used by common messaging commands: 

Code of Meaning 

0 phone failure 

1 no connection to phone 

2 phone-adaptor link reserved 

3 operation not allowed 

4 operation not supported 

5 PH-SIM PIN required 

6 PH-FSIM PIN required 

7 PH-FSIM PUK required 

10 SIM not inserted 

11 SIM PIN required 

12 SIM PUK required 

13 SIM failure 




14 SIM busy 

15 SIM wrong 

16 incorrect password 

17 SIM PIN2 required 

18 SIM PUK2 required 

20 memory full 

21 invalid index 

22 not found 

23 memory failure 

24 text string too long 

25 invalid characters in text string 

26 dial string too long 

27 invalid characters in dial string 

30 no network service 

31 network timeout 

32 network not allowed - emergency calls only 

40 network personalization PIN required 

41 network personalization PUK required 

42 network subset personalization PIN required 

43 network subset personalization PUK required 

44 service provider personalization PIN required 

45 service provider personalization PUK required 

46 corporate personalization PIN required 

47 corporate personalization PUK required 

100 unknown 

103 illegal MS 

106 illegal ME 

107 GPRS services not allowed 

111 PLMN not allowed 

112 location area not allowed 

113 roaming not allowed in this location area 

132 service option not supported 

133 requested service option not subscribed 

134 service option temporarily out of order 

148 unspecified GPRS error 

149 PDP authentication failure 

150 invalid mobile class 

577 GPRS - activation rejected by GGSN 

578 PRS - unspecified activation rejection 

579 GPRS - bad code or protocol rejection 

580 GPRS - can't modify address 

581 GPRS - CHAP close 

582 GPRS - profile (cid) currently unavailable 

583 GPRS - a profile (cid) is currently active 




584 GPRS - combined services not allowed 

585 GPRS - conditional IE error 

586 GPRS - context activation rejected 

587 GPRS - duplicate TI received 

588 GPRS - feature not supported 

589 GPRS - service not available 

590 GPRS - unknown IE from network 

591 GPRS - implicitly detached 

592 GPRS - insufficient resources 

593 GPRS - invalid activation state (0-1) 

594 GPRS - invalid address length 

595 GPRS - invalid character in address string 

596 GPRS - invalid cid value 

597 GPRS - invalid dial string length 

598 GPRS - mode value not in range 

599 GPRS - invalid MAND information 

600 GPRS - SMS service preference out of range 

601 GPRS - invalid TI value 

602 GPRS - IPCP negotiation timeout 

603 GPRS - LCP negotiation timeout 

604 GPRS - LLC error 

605 GPRS - LLC or SNDCP failure 

606 GPRS - lower layer failure 

607 GPRS - missing or unknown APN 

608 GPRS - mobile not ready 

609 GPRS - MS identity not in network 

610 GPRS - MSC temporarily not reachable 

611 GPRS - message incompatible with state 

612 GPRS - message type incompatible with state 

613 GPRS - unknown message from network 

614 GPRS - NCP close 

615 GPRS - network failure 

616 PRS - no echo reply 

617 GPRS - no free NSAPIs 

618 GPRS - processing of multiple cids not supported 

619 GPRS - no PDP context activated 

620 GPRS - normal termination 

621 GPRS - NSAPI already used 

622 GPRS - address element out of range 

623 GPRS - PAP close 

624 GPRS - PDP context w/o TFT already activated 

625 GPRS - PDP type not supported 

626 GPRS - peer refuses our ACCM 

627 GPRS - peer refuses our IP address 




628 GPRS - peer refuses our MRU 

629 GPRS - peer requested CHAP 

630 GPRS - profile (cid) not defined 

631 GPRS - unspecified protocol error 

632 GPRS - QOS not accepted 

633 GPRS - QOS validation fail 

634 GPRS - reactivation required 

635 GPRS - regular deactivation 

636 GPRS - semantic error in TFT operation 

637 GPRS - semantic errors in packet filter 

638 GPRS - semantically incorrect message 

639 GPRS - service type not yet available 

640 GPRS - syntactical error in TFT operation 

641 GPRS - syntactical errors in packet filter 

642 PRS - too many RXJs 

643 GPRS - unknown PDP address or type 

644 GPRS - unknown PDP context 

645 GPRS - user authorization failed 

646 GPRS - QOS invalid parameter 

673 audio manager not ready 

674 audio format cannot be configured 

705 SIM toolkit menu has not been configured 

706 SIM toolkit already in use 

707 SIM toolkit not enabled 

737 +CSCS type not supported 

738 CSCS type not found 

741 must include with 

742 incorrect format 

743 length too long 

744 SIM full 

745 unable to change PLMN list 

746 network operator not recognized 

749 invalid command length 

750 invalid input string 

753 missing required cmd parameter 

754 invalid SIM command 

755 invalid File Id 

756 missing required P1/2/3 parameter 

757 invalid P1/2/3 parameter 

758 missing required command data 

759 invalid characters in command data 

765 invalid input value 

766 unsupported value or mode 

767 operation failed 




768 multiplexer already active 

769 unable to get control of required module 

770 SIM invalid - network reject 

771 call setup in progress 

772 SIM powered down 

773 SIM File not present 

9.2 Summary of CMS ERROR Codes 

Final result code +CMS ERROR: indicates an error related to mobile equipment 

or network. The operation is similar to ERROR result code. None of the following 

commands in the same command line is executed. Neither ERROR nor OK result code 

shall be returned. 

values used by common messaging commands: 

Code of Meaning 

300 ME failure 

301 SMS ME reserved 

302 operation not allowed 

303 operation not supported 

304 invalid PDU mode 

305 invalid text mode 

310 SIM not inserted 

311 SIM pin necessary 

312 PH SIM pin necessary 

313 SIM failure 

314 SIM busy 

315 SIM wrong 

316 SIM PUK required 

317 SIM PIN2 required 

318 SIM PUK2 required 

320 memory failure 

321 invalid memory index 

322 memory full 

330 SMSC address unknown 

331 no network 

332 network timeout 

500 unknown 

512 SIM not ready 

513 unread records on SIM 

514 CB error unknown 

515 PS busy 

517 SM BL not ready 

528 Invalid (non-hex) chars in PDU 




529 Incorrect PDU length 

530 Invalid MTI 

531 Invalid (non-hex) chars in address 

532 Invalid address (no digits read) 

533 Incorrect PDU length (UDL) 

534 Incorrect SCA length 

536 Invalid First Octet (should be 2 or 34) 

537 Invalid Command Type 

538 SRR bit not set 

539 SRR bit set 

540 Invalid User Data Header IE 

10AT Commands Sample 

10.1 Profile Commands 

Demonstration Syntax Expect Result 

The AT command interpreter is 

actively responding to input. 

Display product identification 

information: the manufacturer, the 

product name and the product 

revision information. 

Display current configuration, a list 

of the current active profile 

parameters. 

Reporting of mobile equipment 

errors. The default CME error 

reporting setting is disabled. 

Switching to verbose mode displays 

a string explaining the error in more 

details. 

Storing the current configuration in 

nonvolatile memory. When the 

board is reset, configuration changes 

from the last session are loaded. 

Set the ME to minimum 

functionality 


AT OK 

ATI 

SIMCOM_Ltd 


Revision: 

1008B02SIM300D_ATMEL 

AT&V [A complete listing of the 

AT+CMEE=? 

AT+CMEE? 

AT+CSCS=? 

AT+CSCS=”TEST” 

AT+CMEE=2 

AT+CSCS=”TEST” 

ATE0;&W 

AT 

[Reset the board] 


ATE1;&W 


active profile] 

+CMEE:(0,1,2) 

+CMEE:0 

+CSCS:”GSM” 

+CSCS:”UCS2” 

ERROR 

OK 

+CME ERROR: +CSCS 

type not found 

OK 

[No echo] 

OK 

AT+CFUN=0 OK 

[No echo] 

[Echo on]



ME has entered full functionality mode. AT+CFUN? +CFUN:1 

10.2 SIM Commands 


Listing available phonebooks, and AT+CPBS=? 

+CPBS:(“DC”,”FD”, 

selecting the SIM phone book. 

”LD”,”ON”,”SM”,”MC”) 

AT+CPBS=”SM” OK 

Displaying the ranges of phone book AT+CPBR=? 

entries and listing the contents of the 

+CPBR:(1-150),41,14 

phone book. 

AT+CPBR=1,10 [a listing of phone book 

contents] 

Wrinting an entry to the current AT+CPBW=,”13918 OK 

phonebook. 

18xxxx”, ,”Daniel” 

Finding an entry in the current 

phonebook using a text search. 

Deleting an entry from the current 

phonebook specified by its position 

index. 

10.3 General Commands 


contents] 

AT+CPBF=”Daniel” +CPBF: 5,”139181860 

89”,129,”Daniel” 

AT+CPBW=2,” ” OK 


contents] 


Displays the current network operator AT+COPS? +COPS: 0,0,”CHINA 

that the handset is currently registered 

with. 

MOBILE” 

Display a full list of network operator AT+COPN AT+COPN 

names. 

+COPN:”20201”, 

“COSMO” 

[skip a bit] 

+COPN:”730100”, 

“ENTEL PCS” 

OK 

Power down the phone – reducing its AT+CFUN=0 

OK 

functionality. This will deregister the [wait for deregister] 

handset from the network. 

ATD6241xxxx; NO CARRIER 

AT+CFUN=1 

OK 

CFUN disables access to the SIM. AT+CSMINS=1 OK 

CSMINS shows when the SIM is AT+CFUN=0 

OK 

available again. 

+CSMINS:0 

AT+CFUN=1 

OK 

+CSMINS:1 

Emulating the MIMI keypad to make a AT+CKPD=”6241xx 


OK



voice call. xxs”,4,4 [the voice call is connected] 

Request the IMSI AT+CIMI 460008184101641 

10.4 GPRS Commands 


To establish a GPRS context. Setup modem driver Should be able to surf the 

web using Internet explorer. 

Setup dial up 

connection with *99# 

There are two GPRS Service Codes for 

the ATD Command: Value 98 and 99. 

Establish a connection by service code 

99. 


99, IP address123… and L2P=PPP and 

using CID 1.The CID has to be defined 

by AT+CGDCONT. 


99 and L2P=PPP 


99 and using CID 1 


99 and L2P=PPP and using CID1. The 

CID has to be defined by 

AT+CGDCONT 

Establish an IP connection by service 

code 98 

To check if the MS is connected to the 

GPRS network 

Detach from the GPRS network 

Run internet explorer 

ATD*99# 

ATD*99*123.124.125. 

126*PPP*1# 

ATD*99**PPP# 

ATD*99***1# 

ATD*99**PPP*1# 


AT+CGATT? 

AT+CGATT=0 

To check if the MS is connected to the 

GPRS network 

AT+CGATT? +CGATT : 0 

To check the class of the MS AT+CGCLASS? +CGCLASS:B 

Establish a context using the terminal AT+CGDCONT=1,”I OK 

equipment: defines CID 1 

P” 

CONNECT 

and sets the PDP type to IP, access 

point name and IP address aren’t set. 


 


+CGATT:1 

OK



Cancel a context using the terminal 

equipment 

Pause data transfer and enter command 

mode by +++ 

Stop the GPRS data transfer 

Reconnect a context using the terminal 

equipment 

Resume the data transfer 

Pause the data transfer and make a voice 

call. The release of voice call, resume 

the data transfer 

AT+CGDCONT=1, 

“IP” 


+++ 

ATH 

AT+CGDCONT=1,”I 

P” 

AT*99# 

+++ 

ATO 

AT+CGDCONT=1,”I 

P” 


+++ 

ATD6241xxxx; 





OK 

CONNECT 

 

OK 

OK 

CONNECT 

 

CONNECT 

 

OK 

CONNECT 

 

OK 

OK 

CONNECT 

 

OK 

*Quality of Service (QOS) is a special parameter of a CID which consists of several parameters itself. 

The QOS consists of 

The precedence class 

The delay class 

The reliability class 

The peak throughput class 

The mean throughput class 

And is decided in “requested QOS” and “minimum acceptable QOS”. 

All parameters of the QOS are initiated by default to the “network subscribed value (=0)” but the 

QOS itself is set to be undefined. To define a QOS use the AT+CGQREQ or AT+CGQMIN 


Overwrites the precedence class of 

QOS of CID 1 and sets the QOS of 

CID 1 to be present 

AT+CGQREQ=1,2 OK 

Response: all QOS values of CID 1 

Are set to network subscribed except 

AT+CGQREQ? +CGQREQ:1,2,0,0,0,0 

precedence class which is set 

to 2 

OK 

Set the QOS of CID 1 to not present. 

Once defined, the CID it can be 

activated. 

AT+CGQREQ=1 OK



Activate CID 2, if the CID is already 

active, the mobile returns OK at once. 

AT+CGACT=1,2 OK 

If no CID is defined the mobile 

responses +CME ERROR: invalid index. 

Note: If the mobile is NOT attached 

by AT+CGATT=1 before activating, the 

attach is automatically done by the 

AT+CGACT command. 

AT+CGACT=1,3 +CME ERROR: 123 

Use the defined and activated CID AT+CGDATA=”PPP”, CONNECT 

to get online. The mobile can be 

connected using the parameters of 

1 

appointed 

parameter 

CID or using default 

The mobile supports Layer 2 Protocol(L2P) PPP only. 

Note: If the mobile is NOT attached by AT+CGATT=1 and the CID is NOT activated before 

connecting, attaching and activating is automatically done by the AT+CGDATA command. 

Some providers require to use an APN to establish a GPRS connection. So if you use the 

Microsoft Windows Dial-Up Network and ATD*9… to connect to GPRS you must provide the 

context definition as part of the modem definition (Modem 

properties/Connection/Advanced…/Extra settings.) As an alternative, you can define and activate 

the context in a terminal program (e.g. Microsoft HyperTerminal) and then use the Dial-Up 

Network to send only the ATD command. 

10.5 Call Control Commands 


Make a voice call ATD6241xxxx; OK 

MS makes a voice call 

Hang up a call ATH OK 

Call dropped 

Make a voice call using the last number ATD6241xxxx; OK 

facility. The initial call is established ATH 

then cancelled. The second call is made 

using the previous dial string. 

ATDL 

OK 

Make a circuit switch data call ATD*99# The dial string does 

not include the terminating 

semicolon. The call is made 

to a configured modem. Data 

can be exchanged using a 

terminal emulator. 

Make a circuit switch data call, suspend ATD*99# 

CONNECT 

the call and then resume the call 

 

+++ 

OK 


CONNECT 

 




Example of a MT voice call Make MT voice call to 

MS. 

ATA 


Call related supplementary service: AT+CHLD= 

AT+CHLD. This command provides =0 RELEASE 

support for call waiting functionality. ALL HELD CALLS 

OR SENDS USER 

BUSY STATUS TO 

WAITING CALL 

=1 RELEASE 

ALL ACTIVE CALLS 

AND 

OTHER 

ACCEPT 

CALL(WAITING OR 

HELD) =1X 

RELEASE CALL X 

=2 PLACE ALL 

ACTIVE CALLS ON 

HOLD AND ACCEPT 

CALL =2X 

Terminate current call and accept waiting 

PLACE ALL CALLS 

ON HOLD EXCEPT 

CALL X 

AT+CCWA=1,1 

call. 


Establish a voice call from EVB, receive 

an incoming call(incoming call accepts 

 

waiting status), terminate active call and 

accept incoming call. Note call waiting 

must be active for this option – use 

“AT+CCWA=1,1” before running this 

demonstration. 

AT+CHLD=1 

Set current call to busy and accept ATD6241xxxx; 

waiting call. 


 


waiting status), place active call on hold 


and switch to incoming call. Terminate 

active call and switch back to original 


call. Note call waiting must have been 

previously enabled for this 

demonstration to work. 

Switch between active and held calls. 




RING 

RING 

OK[accept call] 

OK[hang up call] 

Return value:(0,1,1x,2,2x,3) 

OK 

OK 

+CCWA:”62418148”, 

129,1 

OK 

 

+CCWA:”1391818 

6089”,129,1 

OK 

OK 

OK



an incoming call (incoming call accepts 

waiting status), place active call on hold 

and switch to incoming call. Switch 

between both calls, placing each in the 

hold state whilst the other is active 

before terminating each one. This feature 

relies on knowing each call’s ID. This is 

done using the List Current 

Calls(AT+CLCC) command. A call’s ID 

is required to switch between held and 

active calls. Held calls that are not 

automatically resumed when all other 

calls are terminated. They need to be 

made active using the AT+CHLD=2x 

command. Note call waiting must have 

been previously enabled for this 


Send busy status to incoming waiting 

caller. 



waiting status), send ‘busy’ status to 

waiting mobile. Note call waiting must 

have been previously enabled for this 


Drop all calls on hold. 


an incoming call (incoming call accepts 

waiting status), switch to incoming call 

and drop all waiting calls. 

Note call waiting must have been 

previously enabled for this 


 



AT+CCLC 





 



 




+CCWA:”1391818 

6089”,129,1 

OK 

 

OK 

 

+CLCC:1,0,0,0,0,”62 

418148”,129 

+CLCC:3,1,1,0,0,”139 

18186089”,129 

OK 

< note incoming call held 

flag set> 

OK 

 

OK 

 

 

OK 

+CCWA:”1391818 

6089”,129,1 

OK 

OK 

 

OK 

+CCWA:”1391818 

6089”,129,1 

OK 

 

OK 



10.6 SIM Toolkit Commands 


Inform voyager that the accessory AT+STPD=5,1F7FFF7 OK 

Has SAT97 capability and sets the output 

to TEXT mode. 

F7F 

+STC: 25 

AT+CMGF=1 OK 

+STC: 81 

Sets the response timer AT+START=200 OK 

10.7 Audio Commands 


DTMF tones AT+CLDTMF=2,”1,2, DTMF tones generated in the 

3,4,5” 

headset 

10.8 SMS commands 


Set SMS system into text mode, as AT+CMGF=1 

opposed to PDU mode. 

OK 

Send an SMS to myself. 

AT+CMGS=”+861391 

818xxxx” 

+CMGS:34 

>This is a test OK 

Unsolicited notification of the SMS 

arriving 

+CMTI:”SM”,1 

Read SMS message that has just arrived. AT+CMGR=1 +CMGR: “REC UNREAD”, 

Note: the number should be the same as 

“+8613918186089”, ,”02 

that given in the +CMTI notification. 

/01/30,20:40:31+00” 

This is a test 

OK 

Reading the message again changes the AT+CMGR=1 +CMGR: “REC READ”, 

status to “READ” from ”UNREAD” 

“+8613918186089”, 

“02/01/30,20:40:31+00” 


OK 

, 

Send another SMS to myself. AT+CMGS=”+861391 

818xxxx” 

+CMGS:35 

>Test again 

OK 

Unsolicited notification of the SMS 

arriving 

+CMTI:”SM”,2 

Listing all SMS messages. 

AT+CMGL=”ALL” +CMGL: 1,”REC 

Note:”ALL” must be in uppercase. 

READ”,”+8613918186089”, 

, “02/01/30,20:40:31+00” 


+CMGL: 2,”REC 

UNREAD”,” ”,”+861391818 





6089”, 

, “02/01/30,20:45:12+00” 

Test again 

Delete an SMS message. AT+CMGD=1 

OK 

OK 

List all SMS messages to show message AT+CMGL=”ALL” +CMGL: 2,”REC READ”, 

has been deleted. 

“+8613918186 

089”,”02/01/30,20:45:12+00 

” 

Test again 

Send SMS using Chinese characters 

AT+CSMP=17,0,2, 

25 

AT+CSCS=”UCS2” 

AT+CMGS=”0031003 

300390031003800310 

038003x003x003x003 

x” 

>4E014E50 

OK 

OK 

OK 

+CMGS:36 

OK

SIM300D AT Command Set - Distributed Systems and Networking

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